• <tr id="yyy80"></tr>
  • <sup id="yyy80"></sup>
  • <tfoot id="yyy80"><noscript id="yyy80"></noscript></tfoot>
  • 99热精品在线国产_美女午夜性视频免费_国产精品国产高清国产av_av欧美777_自拍偷自拍亚洲精品老妇_亚洲熟女精品中文字幕_www日本黄色视频网_国产精品野战在线观看 ?

    Neutron activation cross section data library

    2022-06-29 09:24:18XiaoLongHuang黃小龍ZhiGangGe葛智剛YongLiJin金永利HaiChengWu吳海成XiTao陶曦JiMinWang王記民LiLeLiu劉麗樂(lè)YueZhang張玥andXiaoFeiWu吳小飛
    Chinese Physics B 2022年6期
    關(guān)鍵詞:永利小龍

    Xiao-Long Huang(黃小龍), Zhi-Gang Ge(葛智剛), Yong-Li Jin(金永利), Hai-Cheng Wu(吳海成), Xi Tao(陶曦),Ji-Min Wang(王記民), Li-Le Liu(劉麗樂(lè)), Yue Zhang(張玥), and Xiao-Fei Wu(吳小飛)

    China Nuclear Data Center,China Institute of Atomic Energy,Beijing 102413,China

    Keywords: neutron reaction cross section, unified Hauser–Feshbach and exciton model (UNF), evaluation,activation data library

    1. Introduction

    The neutron activation cross sections are of importance for a variety of nuclear applications and nuclear physics studies. They are widely used in neutron activation analysis, isotope production, medical technology, oil well logging, and mineral exploration and so on.

    For reactor neutron metrology applications,reactor physicists are interested in updating and improving the multigroup nuclear data input to neutronic codes and point-data input to Monte Carlo codes. For example, the famous Geant4 simulation package relies on the evaluated cross section files seriously. To improve the flexibility of Monte Carlo simulations, update of the evaluated neutron cross section libraries with high precision is required. Meanwhile,the accurate neutron activation cross section is one of the important factors to select suitable materials for reactors. Another application of activation cross sections is that some reactions can be used as threshold detectors to measure neutron spectra of reactors or some neutron fields, which may provide significant information for reactor shielding calculations and for other purposes.

    To meet these requirements,some neutron activation data libraries have been developed. There are two famous and widely used activation data libraries in the world. One is the newly issued activation cross section library which is named IRDFF. It contains about 79 dosimetry reactions within the neutron energy range from 10-5eV to 20 MeV. So its application is limited. Another important activation data library is called EAF-2010. It covers 816 target nuclei in the energy range between 10-5eV and 60 MeV.Recommended neutron reaction data for many targets are from TALYS calculations with global parameters directly. The most important initiative of EAF-2010 is designed for fusion applications.

    In this paper, we present the first activation data library developed at China Nuclear Data Center (CNDC). It covers 818 target nuclei including unstable target or isomeric target nuclei within the induced neutron energy range region from 10-5eV to 20 MeV. It is somewhat different compared to the similar activation data libraries in the world. Because the newly or best experimental data sources published within recent years are considered and a series of sophisticated nuclear reaction model codes are used for data production in our issued high quality library. Also data testing against the cross section systematics are included.The full evaluated dataset containing the evaluated activation cross sections in this paper is openly available at http://doi.org/10.57760/sciencedb.j00113.00024.

    2. Evaluation procedures

    When the experimental data are not enough to provide all nuclear reaction cross sections or target nuclei is unstable, theoretical calculation is necessary. In order to perform the evaluations,CNDC has developed a series of methods and techniques which include the experimental data evaluation,the nuclear reaction model codes[1–3]and systematics. Regarding the available tools, the most important result of this exercise is the improvement of the systematic cross section formula. A new systematic[4]has been derived which is based on the most recent recommended experimental values.

    Generally, the following main evaluation procedures are considered. All available experimental data have been examined and analysed carefully. If there were many experimental data for a reaction channel, the evaluated experimental data were selected for curve fitting by using a program of orthogonal polynomial fit or spline function fit from threshold to 20 MeV.The fitting results were adopted as the recommended cross sections for this reaction channel. If the experimental data were not enough for curve fitting, the theoretical model calculations were performed using a series of nuclear reaction model codes, UNF, FDRR, APMN, etc. For model calculation, there are two different cases. One is a very detailed calculation with various adjusted parameters so as to reproduce these specific experimental data. Another is the so-called large scale, default calculations for many nuclides, in which case adjustment to experimental data is impossible. Finally the systematics were used to re-normalize the calculated cross section for some reaction channels.

    2.1. Experimental data

    Experimental data in EXFOR[5]library were collected and used for the evaluation of reaction cross sections or a guidance of theoretical analysis and calculations. Usually there are two procedures of evaluation experimental data. One is the physically evaluations, where the relevant details were analyzed carefully and some corrections were done. Another is the mathematics processing which deduced the optimum data.Generally if there are enough experimental data that cover the whole energy region for a certain reaction channel, the evaluated experimental data can be adopted as the recommended cross sections for this channel. Otherwise parameters adjustment to experimental data will be made by model calculations.

    2.2. Optical model and optical potential parameters

    The local optical potential parameters play an important role in theoretical calculations and evaluations for a certain nuclei. In order to obtain a set of local neutron optical model potential parameters for a certain element or nuclei,the automatically searching optimal neutron optical potential parameters(APMN[3])code was used. APMN code can search automatically the optimal neutron potential parameters using measured(n, total), (n, non), (n, el) reaction cross sections and elastic scattering angular distributions of these nuclei.

    When there was no experimental information or little experimental data,the relevant measured data of neighbor nuclei were used to obtain the local optical potential parameters. If any experimental data was impossible for a nuclide or neighbor nuclei,global parameters of Ref.[6]were used.

    2.3. FDRR model calculations

    The FDRR[2]code with the full diagonalR-matrix approach and LUNF[1]code with the nuclear statistical model were combined to generate the complete neutron data for the light mass region.

    FDRR is the short expression of full and diagonal reducedR-matrix. It includes fourR-matrix applications. They are multiple level and reducedR-matrix method (MLBW),diagonal energy shift reducedR-matrix method, fullRmatrix method,and un-diagonal energy shift reducedR-matrix method. It can be used to calculate cross sections,angular distributions,and polarization data of 2-bodies reactions.

    LUNF[7]code was developed and used for 1p-shell light elements, which was based on the unified Hauser–Feshbach,exciton model, the statistical theory of light-nucleus reaction and application(STLN).Angular momentum and parity conservations were considered in equilibrium and pre-equilibrium processes. Cross sections, angular distributions, and double differential cross sections in the fast neutron region can be calculated by this code.

    2.4. UNF series model calculations

    UNF[1]is short for unified Hauser–Feshbach and exciton model, which is compiled by FORTRAN language. It is a modern nuclear model code system for the theoretical calculation of nuclear reaction cross sections, which consists of two series. One is the so-called UNF code which is used to obtain the reaction cross sections in the medium heavy mass region(structural materials nuclei,fission product nuclei). The other is called FUNF which is used for actinides or fission nuclides.

    The optical model, the unified Hauser–Feshbach with width fluctuation correction and angular momentum dependent exciton model are included in the common UNF codes system. For the level density,the composite formula proposed by Gilbert and Cameron, consisting of a constant temperature law at low energies and a Fermi gas expression at high energies, is applied. Energy-dependent shell effects are included. Discrete levels are from the Reference Input Parameter Library-3(RIPL-3).[8]In addition,the fission rate adopts the Bohr–Wheeler formula in FUNF code,and the fission process occurs only in the equilibrium process when the incident neutron energies are below 20 MeV.

    UNF only considers gammas, neutrons, protons,deuterons, tritons, helions, alpha-particles and fission emission below 20 MeV. Usually there are two selections when using UNF codes. The first selection is a detailed theoretical analysis and calculations with various adjusted parameters(related initial parameters selected from RIPL-3)to reproduce the experimental well.Another case is a default calculation for many nuclides especially for unstable target when there are no or few experimental data.

    The most straightforward validation of evaluated data library is a direct comparison with differential data. As an example,the evaluated cross sections of93Nb(n,2n)92mNb reaction is showed in Fig. 1. The present result is shown by red lines. Experimental data[9–14]are marked by various symbols.As seen in the figure clearly,the evaluated cross sections show a good agreement with the experimental data.

    Fig.1. Cross section of the 93Nb(n,2n) 92mNb reaction.

    2.5. Resonant channel and resonance parameters

    The induced-neutron energy is from 10-5eV to 20 MeV in the present data library.In so large energy range,if there exists a resonant channel,the reaction cross sections are divided into two regions: “resonance” and “smooth” at the boundary energy about several keV to hundreds keV depending on the target nuclide. The thermal neutron cross sections and resonance parameters are taken from TENDL-2019 or JENDL-4.0 library directly because CNDC has no ability of dealing with resonance parameters. For convenience in applications, all resonance parameters are already converted into a linearised point-wise format,and reasonably connected at the boundary energy. To calculate the point-wise cross section from resonance parameters,the ENDF/B pre-processing codes(PREPRO)[15]were used.

    The PREPRO package consists of 18 computer codes.They are developed to convert ENDF/B formatted neutron data to a form in which the data can be used in applications. In the present work, three codes, LINEAR,RECENT and SIGMA1 from PREPRO package are adopted to produce the point-wise cross section from resonance parameters. The main function of LINEAR code is designed to convert ENDF/B file 3 data to linear–linear interpolable form. The main function of RECENT code is designed to reconstruct the resonance contribution to the cross section in linearly interpolable form, add in any linearly interpolable background cross section and output the result in the ENDF/B format. The resonance contribution is calculated for capture (MT=102) and fission (MT=18)channels. The main function of SIGMA1 code is designed to Doppler broaden neutron induced cross sections. Each section of cross sections(file 3)is read from the ENDF/B format. The data is Doppler broadened,thinned and output in the ENDF/B format.

    3. Data format and contents of the data library

    The standard ENDF-6 data format is adopted to store the recommended data. Brief states about the evaluation method,model codes used for calculation and reaction channels are presented in the file MF=1 with MT=451. The individual reaction cross section is given in MF=3,MF=9 or MF=10.When a reaction populates the ground state only, MF=3 is usually used. When a reaction can populate isomeric state,the individual reaction cross sections are given in MF=9 or MF=10 dependent on its reaction threshold value. For the resonant channel, the total reaction cross section is stored in MF=3 and the branching isomeric ratio in MF=9 when it exists. MF=8 specifies residual nucleus where the isomeric or non-isomeric state information can be found.

    The activation data library contains 818 stable and unstable target nuclei from1H to257Fm within the neutron energy region of 10-5eV–20 MeV.All the resonant channels are already converted into a linearised point-wise format. Table 1 gives the general contents for each nucleus. Table 2 gives all nuclear reaction channels(MT numbers)in MF=3,MF=9 or MF=10.

    Table 1. File types in activation data library.

    Table 2. Nuclear reaction channels in activation data library.

    4. Validation

    Format and physics checking have been performed for the activation data library using CHECKR, FIZCON and PSYCHE codes. It is shown that no significant error messages occurred. Meanwhile activation data library can be tested by the validation for consistency with the available experimental database or with predictions from systematics,theoretical calculations.

    Fig.2. Comparing the relative deviation between the calculated and evaluated(n,non)reaction cross sections.

    Fig. 3. Comparison the present data with systematics for 89Y(n,2n) 88Y reaction.

    5. Conclusion

    The Neutron Activation Cross Section Data Library has been established at CNDC for the first time. 818 stable and unstable target nuclei from1H to257Fm are included in this library within neutron energy region of 10-5eV–20 MeV.Compared with EAF-2010 library, the present activation data are evaluated on the basis of the best experimental data sources within recent years and a series of sophisticated nuclear reaction model codes calculations. Meanwhile, a data testing or normalizing is made by systematics. Reactions with no experimental data are default calculated by global parameters using UNF code system. Analysis of these UNF calculations shows that the theoretical results are of a very high quality,producing excitation function curves with a physically good shape.

    Some improvement processes of cross section evaluations were specially considered in the present neutron activation data library. When there were many experimental data that cover the whole energy region for a certain reaction channel,the best experimental data were selected to do curve fitting by using a program of orthogonal polynomial or spline function fit from threshold to 20 MeV.The best fitted values were adopted as the final evaluations. Otherwise if the relevant experimental data were not enough for curve fitting, the best evaluation or possible existing evaluation was adopted. These evaluations were usually based on UNF model calculations with local parameter and adjusted to fit the available experimental data; or other library is taken, for example a resonant channel in some case. Especially for a nuclide with no experimental information, large scale model calculations using the UNF code system with global parameters were performed. In this case, adjustment to experimental data is impossible. The evaluated neutron activation data are from these default model calculations and in some cases these have been renormalized to cross section systematics.

    The recommended data are stored by standard ENDF-6 format in activation data library.

    Data availability

    The data that support the findings of this study are openly available in Science Data Bank at http://doi.org/10.57760/sciencedb.j00113.00024.

    猜你喜歡
    永利小龍
    El regreso del dragón
    白象:打造有骨氣的民族品牌
    科技興邦 創(chuàng)新強(qiáng)國(guó)
    深圳市永利種業(yè)有限公司
    辣椒雜志(2021年4期)2021-04-14 08:28:14
    詩(shī)經(jīng)
    畢永利教授簡(jiǎn)介
    小小小小龍
    劉小龍
    讓“數(shù)”“形”結(jié)合更暢通
    風(fēng)中的祈禱詞
    詩(shī)選刊(2015年4期)2015-10-26 08:45:28
    亚洲精品乱久久久久久| 亚洲国产欧美在线一区| 国产精品亚洲av一区麻豆 | 丝袜喷水一区| 国产不卡av网站在线观看| 成人午夜精彩视频在线观看| 看十八女毛片水多多多| 免费高清在线观看视频在线观看| 看非洲黑人一级黄片| 成人国产av品久久久| 亚洲av福利一区| 老司机影院毛片| 又粗又硬又长又爽又黄的视频| 亚洲精品aⅴ在线观看| 天天躁夜夜躁狠狠久久av| 青草久久国产| 国产一区亚洲一区在线观看| 国产欧美日韩综合在线一区二区| 国产男人的电影天堂91| 91精品国产国语对白视频| 日本vs欧美在线观看视频| 日韩成人av中文字幕在线观看| 99香蕉大伊视频| 欧美日韩综合久久久久久| 中文字幕人妻丝袜制服| 久久久久精品久久久久真实原创| 成人国产麻豆网| 久久久国产一区二区| 久久久久久伊人网av| 一边亲一边摸免费视频| 好男人视频免费观看在线| 成人18禁高潮啪啪吃奶动态图| 精品少妇内射三级| 在线免费观看不下载黄p国产| 久久久久久久国产电影| 女人被躁到高潮嗷嗷叫费观| 赤兔流量卡办理| 国产在线免费精品| 亚洲av中文av极速乱| 日韩精品有码人妻一区| 亚洲美女视频黄频| 亚洲国产精品一区三区| 五月天丁香电影| 麻豆乱淫一区二区| 日本欧美视频一区| 国产探花极品一区二区| 91午夜精品亚洲一区二区三区| 国产极品粉嫩免费观看在线| 亚洲av电影在线观看一区二区三区| 99久久综合免费| 国产高清国产精品国产三级| 91午夜精品亚洲一区二区三区| 久久午夜综合久久蜜桃| 日韩一本色道免费dvd| 久久av网站| 亚洲图色成人| 成人午夜精彩视频在线观看| 色94色欧美一区二区| 亚洲av日韩在线播放| 香蕉国产在线看| 国产成人免费观看mmmm| 免费观看无遮挡的男女| 黄网站色视频无遮挡免费观看| 日本91视频免费播放| 久久亚洲国产成人精品v| 国产av精品麻豆| 青草久久国产| 久久久精品94久久精品| 不卡av一区二区三区| 亚洲三区欧美一区| 美女中出高潮动态图| 欧美日本中文国产一区发布| 久久精品国产亚洲av涩爱| 天堂中文最新版在线下载| 1024视频免费在线观看| 99热网站在线观看| 中国国产av一级| 久久国内精品自在自线图片| 久久精品夜色国产| 老女人水多毛片| av网站免费在线观看视频| 欧美在线黄色| 久久精品国产亚洲av高清一级| 最近最新中文字幕免费大全7| 午夜福利影视在线免费观看| 国产日韩欧美在线精品| 午夜福利网站1000一区二区三区| 2018国产大陆天天弄谢| 麻豆精品久久久久久蜜桃| 少妇被粗大的猛进出69影院| 91国产中文字幕| 久久ye,这里只有精品| 最近的中文字幕免费完整| 精品国产一区二区三区四区第35| 日韩人妻精品一区2区三区| 欧美日韩亚洲国产一区二区在线观看 | 久久久久久久大尺度免费视频| 国产欧美亚洲国产| 成人国产av品久久久| 亚洲精品国产av蜜桃| 久久久久国产网址| 一本色道久久久久久精品综合| 欧美人与性动交α欧美软件| 一区二区日韩欧美中文字幕| 日本色播在线视频| 国产在视频线精品| 国产日韩欧美在线精品| 黄片无遮挡物在线观看| 欧美日韩国产mv在线观看视频| 国产亚洲精品第一综合不卡| 久久精品aⅴ一区二区三区四区 | 欧美精品av麻豆av| 在线观看免费高清a一片| 久久精品国产亚洲av天美| 免费高清在线观看日韩| 国产精品三级大全| 香蕉精品网在线| 美女高潮到喷水免费观看| 精品一区二区三区四区五区乱码 | 午夜日韩欧美国产| 日本欧美视频一区| av免费观看日本| 91精品伊人久久大香线蕉| 国产在线一区二区三区精| 在线天堂最新版资源| 中文精品一卡2卡3卡4更新| 老司机亚洲免费影院| 久热这里只有精品99| 午夜福利网站1000一区二区三区| 午夜免费鲁丝| 少妇精品久久久久久久| av在线观看视频网站免费| 黄色怎么调成土黄色| 免费黄网站久久成人精品| 最近中文字幕2019免费版| 国产精品人妻久久久影院| 水蜜桃什么品种好| 伦理电影大哥的女人| 亚洲av成人精品一二三区| 一本久久精品| 欧美黄色片欧美黄色片| 久久久精品国产亚洲av高清涩受| 久久久久精品性色| 成人免费观看视频高清| 亚洲欧洲日产国产| 女的被弄到高潮叫床怎么办| 免费女性裸体啪啪无遮挡网站| 一级毛片电影观看| 中文字幕制服av| 最近中文字幕2019免费版| 国产亚洲午夜精品一区二区久久| 国产欧美日韩一区二区三区在线| 午夜福利网站1000一区二区三区| 我的亚洲天堂| 十八禁高潮呻吟视频| 亚洲国产精品一区二区三区在线| 校园人妻丝袜中文字幕| 免费少妇av软件| 只有这里有精品99| 国产在视频线精品| 久久鲁丝午夜福利片| 亚洲av男天堂| 激情视频va一区二区三区| 成人亚洲精品一区在线观看| 欧美精品av麻豆av| 一个人免费看片子| 欧美精品一区二区免费开放| 丰满少妇做爰视频| 亚洲国产精品999| 免费播放大片免费观看视频在线观看| 最近手机中文字幕大全| 亚洲成av片中文字幕在线观看 | 久久久久久久大尺度免费视频| 大陆偷拍与自拍| 色哟哟·www| 蜜桃国产av成人99| 成人毛片a级毛片在线播放| 亚洲情色 制服丝袜| 中文字幕制服av| 亚洲成人av在线免费| 欧美日韩亚洲国产一区二区在线观看 | 欧美精品一区二区大全| 国产免费视频播放在线视频| 国产av一区二区精品久久| 少妇被粗大猛烈的视频| 最近的中文字幕免费完整| 久久精品人人爽人人爽视色| 激情五月婷婷亚洲| 丁香六月天网| 国产 一区精品| 精品久久久精品久久久| 久久久久精品人妻al黑| www.熟女人妻精品国产| 国产亚洲精品第一综合不卡| 美女主播在线视频| 最近的中文字幕免费完整| videosex国产| 成人18禁高潮啪啪吃奶动态图| 十八禁高潮呻吟视频| 婷婷色麻豆天堂久久| 大片免费播放器 马上看| 久久精品国产a三级三级三级| 成人毛片60女人毛片免费| 在线观看美女被高潮喷水网站| 新久久久久国产一级毛片| 国产极品天堂在线| 亚洲av免费高清在线观看| 国产伦理片在线播放av一区| 七月丁香在线播放| 如何舔出高潮| 欧美xxⅹ黑人| 9191精品国产免费久久| 亚洲成av片中文字幕在线观看 | 丝瓜视频免费看黄片| 欧美精品人与动牲交sv欧美| 热re99久久国产66热| 午夜福利乱码中文字幕| 久久这里只有精品19| 日韩 亚洲 欧美在线| 亚洲国产精品999| freevideosex欧美| 免费观看无遮挡的男女| 欧美97在线视频| 色网站视频免费| 欧美另类一区| 一个人免费看片子| 哪个播放器可以免费观看大片| 午夜福利影视在线免费观看| 精品少妇黑人巨大在线播放| 国产亚洲欧美精品永久| 伊人久久国产一区二区| 男人操女人黄网站| 国产精品国产三级国产专区5o| 亚洲成人av在线免费| 亚洲情色 制服丝袜| 国产又爽黄色视频| 精品久久久久久电影网| 老汉色∧v一级毛片| 大话2 男鬼变身卡| 亚洲婷婷狠狠爱综合网| 捣出白浆h1v1| 91久久精品国产一区二区三区| 乱人伦中国视频| 18在线观看网站| 欧美人与性动交α欧美软件| 国产高清不卡午夜福利| 亚洲 欧美一区二区三区| 日韩精品免费视频一区二区三区| 日日撸夜夜添| 久久久久久久大尺度免费视频| a级毛片在线看网站| 午夜老司机福利剧场| 99国产精品免费福利视频| 欧美精品国产亚洲| av在线老鸭窝| 免费在线观看黄色视频的| 精品卡一卡二卡四卡免费| 涩涩av久久男人的天堂| 亚洲成人av在线免费| 亚洲av.av天堂| 日韩中文字幕欧美一区二区 | 国产欧美亚洲国产| 国产综合精华液| 国产免费又黄又爽又色| 七月丁香在线播放| 中文字幕制服av| 婷婷色麻豆天堂久久| 超碰成人久久| 欧美激情高清一区二区三区 | 日产精品乱码卡一卡2卡三| 嫩草影院入口| 国产在线视频一区二区| 欧美日韩视频高清一区二区三区二| 天天影视国产精品| 国产欧美日韩综合在线一区二区| 丝袜在线中文字幕| 免费人妻精品一区二区三区视频| 国产黄色视频一区二区在线观看| 亚洲精品aⅴ在线观看| 欧美日韩国产mv在线观看视频| 国产探花极品一区二区| 午夜免费鲁丝| 国产精品国产av在线观看| 中国三级夫妇交换| 久久精品国产鲁丝片午夜精品| 男人操女人黄网站| 久久久久久免费高清国产稀缺| 久久久久久久久久久久大奶| 色婷婷久久久亚洲欧美| 一级毛片黄色毛片免费观看视频| 性色avwww在线观看| 欧美日本中文国产一区发布| 亚洲精品久久午夜乱码| 国产午夜精品一二区理论片| 免费久久久久久久精品成人欧美视频| 亚洲三级黄色毛片| 国产精品人妻久久久影院| av线在线观看网站| 99热国产这里只有精品6| 久久精品久久久久久久性| 纵有疾风起免费观看全集完整版| 中文乱码字字幕精品一区二区三区| 最近中文字幕2019免费版| 中文字幕av电影在线播放| 人妻一区二区av| 精品一区在线观看国产| 久久精品aⅴ一区二区三区四区 | tube8黄色片| 国产欧美日韩综合在线一区二区| 在线亚洲精品国产二区图片欧美| 纵有疾风起免费观看全集完整版| 天美传媒精品一区二区| 少妇人妻精品综合一区二区| 国产伦理片在线播放av一区| 欧美人与性动交α欧美精品济南到 | 国产高清国产精品国产三级| 亚洲国产成人一精品久久久| 免费观看在线日韩| 久久久精品94久久精品| 午夜精品国产一区二区电影| 中文字幕另类日韩欧美亚洲嫩草| 国产激情久久老熟女| 啦啦啦啦在线视频资源| 在线天堂最新版资源| av天堂久久9| 国产深夜福利视频在线观看| 男女免费视频国产| 国产激情久久老熟女| 国产日韩欧美亚洲二区| 性少妇av在线| 伊人久久国产一区二区| 一区在线观看完整版| 麻豆乱淫一区二区| 久久99蜜桃精品久久| 久久国内精品自在自线图片| 久久久精品免费免费高清| www.自偷自拍.com| 国产日韩欧美亚洲二区| 久久免费观看电影| 99热网站在线观看| 亚洲精品国产av成人精品| 一级爰片在线观看| 精品国产一区二区久久| 韩国精品一区二区三区| 日韩中字成人| 久久人人97超碰香蕉20202| 看非洲黑人一级黄片| 国产精品蜜桃在线观看| av福利片在线| 久久久久久久国产电影| 亚洲国产av新网站| 亚洲国产精品国产精品| 久久久久久伊人网av| 高清在线视频一区二区三区| 日韩一卡2卡3卡4卡2021年| 日韩制服丝袜自拍偷拍| 久久这里只有精品19| 999久久久国产精品视频| 亚洲色图 男人天堂 中文字幕| 亚洲三区欧美一区| 亚洲天堂av无毛| 国产成人欧美| av福利片在线| 日日啪夜夜爽| 十分钟在线观看高清视频www| 亚洲av在线观看美女高潮| 久久久久精品久久久久真实原创| 亚洲av在线观看美女高潮| 久久这里只有精品19| www.自偷自拍.com| 色吧在线观看| 久久久国产欧美日韩av| 精品久久蜜臀av无| 日韩视频在线欧美| av一本久久久久| 热99久久久久精品小说推荐| 国产精品一区二区在线不卡| 91精品三级在线观看| 精品少妇久久久久久888优播| 国产在线视频一区二区| 亚洲精品av麻豆狂野| 人妻 亚洲 视频| 国产精品欧美亚洲77777| 赤兔流量卡办理| 成人影院久久| 黑人巨大精品欧美一区二区蜜桃| 日本vs欧美在线观看视频| 男女午夜视频在线观看| 日韩中文字幕视频在线看片| 午夜影院在线不卡| 一级毛片电影观看| 99re6热这里在线精品视频| 最近中文字幕高清免费大全6| 亚洲精品美女久久久久99蜜臀 | 一区二区av电影网| 新久久久久国产一级毛片| 18禁裸乳无遮挡动漫免费视频| 国产精品久久久av美女十八| 久久久久视频综合| 精品视频人人做人人爽| 在线观看国产h片| 亚洲,欧美,日韩| 色视频在线一区二区三区| 在线天堂中文资源库| 一区二区三区四区激情视频| 亚洲经典国产精华液单| 日韩免费高清中文字幕av| 亚洲欧美精品自产自拍| 黄色视频在线播放观看不卡| 18在线观看网站| 少妇熟女欧美另类| 国产精品一国产av| 亚洲精品中文字幕在线视频| 亚洲国产av新网站| 日韩视频在线欧美| 成人18禁高潮啪啪吃奶动态图| 91精品三级在线观看| 啦啦啦视频在线资源免费观看| 女人久久www免费人成看片| 欧美日韩国产mv在线观看视频| 天堂中文最新版在线下载| 丝袜脚勾引网站| 1024视频免费在线观看| 香蕉精品网在线| 久久这里只有精品19| 天天躁狠狠躁夜夜躁狠狠躁| www.精华液| 尾随美女入室| 免费观看无遮挡的男女| 黄频高清免费视频| 亚洲五月色婷婷综合| 制服诱惑二区| 女人高潮潮喷娇喘18禁视频| 国产成人精品婷婷| 蜜桃在线观看..| 国产一区二区 视频在线| 亚洲国产看品久久| 熟女电影av网| 午夜av观看不卡| 免费在线观看视频国产中文字幕亚洲 | 国产精品无大码| 成年av动漫网址| 色婷婷av一区二区三区视频| h视频一区二区三区| 亚洲精品国产色婷婷电影| 国产成人一区二区在线| 午夜福利视频精品| 国产成人精品无人区| 一二三四在线观看免费中文在| 黄片无遮挡物在线观看| 亚洲少妇的诱惑av| 狠狠婷婷综合久久久久久88av| 成年人午夜在线观看视频| 久久免费观看电影| 女的被弄到高潮叫床怎么办| 亚洲av福利一区| 久久久精品免费免费高清| 青青草视频在线视频观看| 亚洲成色77777| 久久国内精品自在自线图片| 亚洲人成电影观看| 黑人巨大精品欧美一区二区蜜桃| 久久久国产一区二区| 免费在线观看完整版高清| 男男h啪啪无遮挡| 大话2 男鬼变身卡| 国产乱来视频区| 少妇被粗大猛烈的视频| 亚洲第一av免费看| 在线观看国产h片| 久久久久久久久久久免费av| 热99国产精品久久久久久7| 一级,二级,三级黄色视频| 如何舔出高潮| xxx大片免费视频| 黄片小视频在线播放| 中文字幕av电影在线播放| 天堂中文最新版在线下载| 日韩一区二区三区影片| 人人妻人人澡人人看| 国产xxxxx性猛交| 两个人看的免费小视频| 最近中文字幕2019免费版| 国产成人aa在线观看| 日本av免费视频播放| videos熟女内射| 一边亲一边摸免费视频| 欧美日本中文国产一区发布| 国产精品熟女久久久久浪| 超色免费av| 久久精品国产a三级三级三级| 国产男女内射视频| 亚洲在久久综合| 欧美日韩国产mv在线观看视频| 精品人妻偷拍中文字幕| 天天躁夜夜躁狠狠躁躁| 亚洲内射少妇av| 捣出白浆h1v1| www日本在线高清视频| 青草久久国产| 免费黄频网站在线观看国产| 精品一区在线观看国产| 人人妻人人澡人人爽人人夜夜| 下体分泌物呈黄色| av免费观看日本| 午夜影院在线不卡| 午夜免费鲁丝| 国产免费福利视频在线观看| 国产亚洲一区二区精品| 成人国语在线视频| 人人妻人人爽人人添夜夜欢视频| 国产在视频线精品| 国产精品成人在线| 新久久久久国产一级毛片| 伦理电影免费视频| 久久国产精品大桥未久av| 亚洲欧美精品综合一区二区三区 | 侵犯人妻中文字幕一二三四区| 又大又黄又爽视频免费| 男女无遮挡免费网站观看| 久久精品久久精品一区二区三区| 免费观看av网站的网址| 一区二区三区激情视频| 99热网站在线观看| 国产精品不卡视频一区二区| 午夜福利影视在线免费观看| 大香蕉久久成人网| 丝袜喷水一区| 日韩成人av中文字幕在线观看| 黄频高清免费视频| 999精品在线视频| 国产精品亚洲av一区麻豆 | 国产一区二区三区av在线| 天天躁狠狠躁夜夜躁狠狠躁| 午夜免费鲁丝| 男女下面插进去视频免费观看| 晚上一个人看的免费电影| 一级片'在线观看视频| 久久久久国产网址| 欧美日韩精品网址| 亚洲美女视频黄频| 18+在线观看网站| 99久久综合免费| 天天躁夜夜躁狠狠久久av| 丝瓜视频免费看黄片| av一本久久久久| 亚洲成人av在线免费| 人妻系列 视频| 一本—道久久a久久精品蜜桃钙片| 亚洲欧美成人精品一区二区| 婷婷色综合www| 如日韩欧美国产精品一区二区三区| 国产在线一区二区三区精| 国产精品一区二区在线不卡| 你懂的网址亚洲精品在线观看| 免费看av在线观看网站| 精品久久蜜臀av无| 九草在线视频观看| 国产精品久久久久久精品电影小说| 日本午夜av视频| 精品一区二区三卡| 美女福利国产在线| 美女大奶头黄色视频| 天天躁夜夜躁狠狠躁躁| 亚洲精品国产色婷婷电影| 最近中文字幕2019免费版| 热re99久久精品国产66热6| 亚洲国产欧美在线一区| 美女高潮到喷水免费观看| 一级a爱视频在线免费观看| 亚洲欧美成人综合另类久久久| 久久久精品免费免费高清| 亚洲国产最新在线播放| 免费人妻精品一区二区三区视频| 日本欧美视频一区| 午夜福利视频精品| 超色免费av| 国产又爽黄色视频| 久久韩国三级中文字幕| freevideosex欧美| 久久久久久久亚洲中文字幕| 啦啦啦视频在线资源免费观看| 视频在线观看一区二区三区| 精品亚洲乱码少妇综合久久| 成人18禁高潮啪啪吃奶动态图| 天堂中文最新版在线下载| 在线亚洲精品国产二区图片欧美| 男女国产视频网站| 欧美日韩一区二区视频在线观看视频在线| 香蕉精品网在线| 久久久精品94久久精品| 日本免费在线观看一区| 纯流量卡能插随身wifi吗| 午夜久久久在线观看| 99精国产麻豆久久婷婷| 在线观看www视频免费| 欧美日韩亚洲国产一区二区在线观看 | 国产精品偷伦视频观看了| 伦理电影免费视频| 午夜福利乱码中文字幕| 久久久久久久久免费视频了| 亚洲国产日韩一区二区| 国语对白做爰xxxⅹ性视频网站| 欧美精品一区二区大全| 国产精品国产三级国产专区5o| 最新的欧美精品一区二区| 97精品久久久久久久久久精品| 香蕉国产在线看| 久久精品国产a三级三级三级| 又粗又硬又长又爽又黄的视频| 亚洲人成网站在线观看播放| 天堂8中文在线网| 国产免费现黄频在线看| 亚洲精品日本国产第一区| 这个男人来自地球电影免费观看 |