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   25467篇
  免费   1449篇
各国政治   1067篇
工人农民   1130篇
世界政治   1860篇
外交国际关系   806篇
法律   16983篇
中国共产党   2篇
中国政治   150篇
政治理论   4791篇
综合类   127篇
  2021年   147篇
  2020年   502篇
  2019年   560篇
  2018年   710篇
  2017年   751篇
  2016年   842篇
  2015年   644篇
  2014年   692篇
  2013年   2588篇
  2012年   645篇
  2011年   749篇
  2010年   704篇
  2009年   746篇
  2008年   730篇
  2007年   705篇
  2006年   731篇
  2005年   638篇
  2004年   631篇
  2003年   537篇
  2002年   602篇
  2001年   1006篇
  2000年   923篇
  1999年   702篇
  1998年   393篇
  1997年   307篇
  1996年   300篇
  1995年   290篇
  1994年   298篇
  1993年   294篇
  1992年   465篇
  1991年   478篇
  1990年   463篇
  1989年   455篇
  1988年   468篇
  1987年   421篇
  1986年   490篇
  1985年   477篇
  1984年   379篇
  1983年   358篇
  1982年   268篇
  1981年   258篇
  1980年   214篇
  1979年   322篇
  1978年   180篇
  1977年   159篇
  1976年   137篇
  1975年   131篇
  1974年   185篇
  1973年   139篇
  1972年   130篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
231.
232.
233.
234.
235.
236.
237.
Isoenzyme band patterns of animal blood erythrocyte acid phosphatase (EAP) and phosphoglucomutase-1 (PGM) were studied by isoelectric focusing on ultrathin polyacrylamide gels. For blood from all animals tested (dog, cat, cow, sheep, and goat), the overall band patterns for both isoenzymes were different from those of the most common human types of these enzymes, although some animal EAP and PGM bands appeared in the human band areas. When mixtures of human and animal red blood cells were studied, it was found that misinterpretation of human types was possible only if the overall band pattern of the mixtures was ignored. For the animal blood tested, the strong PGM bands appearing outside the human band areas could be used as "markers" for the possible presence of animal blood in the samples tested.  相似文献   
238.
239.
240.
This brief opposes the overturn of "Roe v. Wade" and resists weakening "Roe's central holding" that would allow states to overturn legal abortion. The brief was written for 885 law professors. "Roe" was not a "constitutional aberration," or "an exercise of raw, judicial power." Some members of the Supreme Court seem to think that the state has "an overriding interest" in protecting fetal life. Some Court members have questioned "Roe's" trimester framework. A person's decision to abort should be done privately. If women are not free to choose abortion, they will not have equality. There is an absence of "express rights of privacy and procreational freedom" in the Constitution. "Roe" was 1 instance of the Court's recognition of constitutional rights that are not named explicitly. Historical materials are drawn on to show the link between trends in society and the "judicial recognition of unenumerated rights." The most serious questions about "Roe" deal with its trimester framework. Justice Blackmun's majority opinion said that the 1st trimester of pregnancy was personal. "Roe" said that abortions created a medical risk at the beginning of the 2nd trimester. Therefore, the government was more interested in the health of the mother at that time. The state could then regulate abortion "in ways that are reasonable related to maternal health." The start of the 3rd trimester was when the fetus was viable. The right of a woman to end her pregnancy "offends powerful moral forces." Some of "Roe's" critics had their scientific facts wrong. Medical authorities think Justice O'Connor is mistaken when she says that "Roe" is "on a collision course with itself." The 23rd to 24th week of pregnancies where the fetal organs can "sustain life outside the womb." This has not changed since "Roe" was decided in 1973, nor is it likely to in the future. Some "amici" believe that the state can never have an interest in the fetus. The state can not have an interest in the fetus distinct from the woman who will give birth to it. During previability, restricting a woman's procreational rights would not be scientifically supportable. The state does have an interest in "upholding the value of human life." "Roe" is "within the mainstream" of constitutional jurisprudence and should be reaffirmed.  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