首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   19720篇
  免费   936篇
各国政治   933篇
工人农民   650篇
世界政治   1573篇
外交国际关系   771篇
法律   12197篇
中国共产党   3篇
中国政治   120篇
政治理论   4294篇
综合类   115篇
  2021年   118篇
  2020年   324篇
  2019年   397篇
  2018年   463篇
  2017年   546篇
  2016年   549篇
  2015年   448篇
  2014年   471篇
  2013年   2184篇
  2012年   431篇
  2011年   541篇
  2010年   514篇
  2009年   543篇
  2008年   520篇
  2007年   481篇
  2006年   506篇
  2005年   484篇
  2004年   499篇
  2003年   450篇
  2002年   460篇
  2001年   784篇
  2000年   698篇
  1999年   541篇
  1998年   326篇
  1997年   263篇
  1996年   223篇
  1995年   236篇
  1994年   274篇
  1993年   255篇
  1992年   359篇
  1991年   396篇
  1990年   358篇
  1989年   385篇
  1988年   334篇
  1987年   343篇
  1986年   373篇
  1985年   361篇
  1984年   283篇
  1983年   308篇
  1982年   223篇
  1981年   238篇
  1980年   166篇
  1979年   258篇
  1978年   168篇
  1977年   144篇
  1976年   142篇
  1975年   100篇
  1974年   142篇
  1973年   138篇
  1972年   115篇
排序方式: 共有10000条查询结果,搜索用时 9 毫秒
891.
This article attempts to build a bridge between contemporary studies of global firms from emerging economies and existing theories in comparative political economy. It argues that given the primacy of the state as an economic actor in developing countries, the variety of capitalism literature could provide a theoretical foundation for firm-level analyses of emerging market multinationals. For example, the authors suggest that China and India may be moving towards a ‘hybrid market economy’. They also offer a typology of Indian and Chinese corporates to demonstrate an empirical approach to analysing domestic business–government relationships and the ways in which these firms are shaped by the peculiarities of their respective institutional setting. Finally, they identify some of the likely pitfalls of doing cross-national comparisons of emerging market multinationals, particularly with respect to the reliability of corporate data.  相似文献   
892.
The performance of the polymorphic marker systems group-specific component (GC), phosphoglucomutase-1 (PGM), alpha-2-HS-glycoprotein (A2HS), haptoglobin (Hp), and erythrocyte acid phosphatase (EAP) was evaluated on control bloodstains. The major factors considered were: sensitivity of the test system; stability of the marker; laboratory economics of each test; and distinguishing power (Dp) of the system. GC was considered to be the most suitable marker for routine screening because of its high stability and Dp, and the sensitivity of the immunoblotting detection method. PGM and A2HS were the next most valuable markers followed by Hp. EAP could only be considered useful when large amounts of relatively fresh bloodstain were available.  相似文献   
893.
This report describes a collaborative study on typing group-specific component (GC), conducted between the Central Research and Support Establishment and the forensic science laboratories of England, Wales and Northern Ireland. A population study (n=114) was performed. Fifty blood donors were selected to provide a distribution, slightly biased from normal, in favour of the GC 1F-1F and GC 1F-1S phenotypes. A protocol was devised for preparing large bloodstains. The strongest GC bands were obtained from the edge of a stain after the blood had been treated with K+/EDTA. Each laboratory received a representative portion of the large bloodstains for GC typing. Five of the eight laboratories correctly grouped all the bloodstains. No errors directly attitributable to the system were recorded in over 800 tests, indicating that GC in bloodstains can be typed reliably using the combination of isoelectric focusing in ultrathin narrow pH interval gels followed by immunofixation and silver staining.  相似文献   
894.
The isolation of spermatozoa from sexual assault swabs using proteinase K   总被引:1,自引:0,他引:1  
The most common examination in sexual offences is the identification of spermatozoa in aqueous extracts from swabs. Using Proteinase K with sodium dodecyl sulphate, it is possible to digest all the cellular material apart from the spermatozoa, resulting in a quick and effective method of their isolation. Spermatozoa were detected in 18 extracts using this treatment when the normal method had failed to reveal all but one of them.  相似文献   
895.
Document examiners sometimes eliminate writers on the basis of differences which are given too much weight. This article is an attempt to explain some conditions whereby differences in the writing of one individual are misinterpreted as significant differences, when they are actually caused by conditions which are unknown to the examiner.  相似文献   
896.
897.
Postmortem stability of DNA   总被引:11,自引:0,他引:11  
High-molecular-weight DNA was recovered postmortem in sufficient quantities from various human organ tissues as well as from blood, although not all organs were equally well suitable. Good DNA stability was found in brain cortex, lymph nodes and psoas muscle over a period of three weeks postmortem. Spleen and kidney showed good DNA stability up to five days postmortem but after longer periods, rapid degradation was observed. Yields of DNA from blood were not consistent because of the non homogeneity of samples. Blood clots were rich with DNA. Generally, the amount of degraded DNA correlated directly with the duration of the postmortem period. However in some cases, DNA degradation was already prominent after a short period. However in some cases, DNA degradation was already prominent after a short period. Case histories showed that high environmental temperature at the site of death and/or infectious diseases prior to death were the main factors for rapid autolysis. Gradual disappearance to complete loss of the long fragments (15-23 kb) was observed in DNA fingerprinting using the minisatellite probe 33.15. No extra-bands were noted, thus excluding erroneous conclusions. However, evidentiary value of older samples was lower.  相似文献   
898.
A woman pleaded guilty to road traffic offences and was sentenced to be disqualified for holding or obtaining a driving licence for six months. Her appeal against that sentence was allowed on the basis that she was suffering from premenstrual tension at the time of the offences, and that the disqualification imposed was neither necessary nor appropriate.  相似文献   
899.
Policymakers have actively pursued urban renewal and dispersal programs to deconcentrate poverty in urban neighborhoods. Relocation strategies lead to new housing opportunities and may encourage employment opportunities for relocated residents if resourceful contacts and job information become more easily available after the move. This study provides an innovative evaluation of the early impacts of involuntary relocation programs in the Netherlands on the housing careers, earnings and employment rates of forced relocatees. It establishes a quasi-experimental design by employing unique longitudinal individual-level population registry data from Statistics Netherlands: forced relocatees are tracked and matched to a control group consisting of similar residents that were not forced to move. A difference-in-difference design shows that forced relocatees are living in less deprived neighborhoods after the move. However, we find no conclusive evidence that this upgrade in housing leads to more socioeconomic opportunities for the forced relocatees.  相似文献   
900.
Several developing countries are currently experiencing a significant fertility decline, however, academic economists have paid little attention to this transition. This paper seeks to explain the fertility transition by infant mortality, urbanisation, income, culture and educational attainment of females and males using annual data for 92 developing countries over the period 1960–2014. External instruments are used to deal with endogeneity. The results suggest that increasing per capita income, improved female education and increasing secularisation have been important determinants for declining fertility in the developing world.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号