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   12404篇
  免费   412篇
各国政治   523篇
工人农民   461篇
世界政治   862篇
外交国际关系   423篇
法律   7520篇
中国政治   80篇
政治理论   2833篇
综合类   114篇
  2020年   166篇
  2019年   222篇
  2018年   266篇
  2017年   329篇
  2016年   305篇
  2015年   226篇
  2014年   249篇
  2013年   1185篇
  2012年   293篇
  2011年   336篇
  2010年   276篇
  2009年   336篇
  2008年   344篇
  2007年   340篇
  2006年   328篇
  2005年   298篇
  2004年   290篇
  2003年   286篇
  2002年   287篇
  2001年   459篇
  2000年   395篇
  1999年   322篇
  1998年   186篇
  1997年   136篇
  1996年   154篇
  1995年   158篇
  1994年   148篇
  1993年   147篇
  1992年   248篇
  1991年   274篇
  1990年   253篇
  1989年   258篇
  1988年   237篇
  1987年   234篇
  1986年   279篇
  1985年   272篇
  1984年   238篇
  1983年   218篇
  1982年   164篇
  1981年   133篇
  1980年   128篇
  1979年   160篇
  1978年   90篇
  1977年   115篇
  1976年   98篇
  1975年   73篇
  1974年   91篇
  1973年   86篇
  1972年   82篇
  1971年   71篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
281.
The author assesses the reliability of the eleventh general population and housing census conducted in Mexico in March 1990. An undercount of as many as two million persons is estimated. (SUMMARY IN ENG)  相似文献   
282.
283.
284.
285.
Child mortality was analyzed in relation to 3 dimensions of reproductive behavior: birth intervals, additional children desired, and contraceptive use. Study data were drawn from a 1978 survey conducted in 2 predominantly rural governorates, Beheira and Kafr El-Sheikh, in lower Egypt. Within each governorate, 2 districts were selected on the basis of their distance from the capital of the governorate, agricultural output by major crops, percent of the population urban, infant mortality rate, and crude birthrate. Within each of the 4 districts, villages were randomly drawn from 3 strata: villages lacking any governmental services; villages with limited services (health center or primary school); and villages served by a combined unit center providing integrated services. A random sample of household heads was selected from household registration records of the provision office of each district. 1200 interviews were obtained from 685 households. Restriction of the sample to women with 1 or more live births, and the elimination of 13 cases with incomplete or inaccurate information, yielded 1010 cases for analysis. The basic measure of actual fertility was birth intervals. For the total sample and within each age category, cumulative fertility is higher the greater the number of child deaths. The data demonstrate a strong relationship between child mortality experience and cumulative fertility. The problem lies in interpreting such results. With some exceptions, birth intervals increased as expected with increasing parity. Women without child death experience displayed longer birth intervals than women who had not lost a child. With the single exception of the 7th parity women, all differences were statistically significant. The data fail to eliminate potential biological influences on subsequent fertility. With biological influences adequately controlled, no behavioral differences remained. Women who experienced child mortality desired greater numbers of additional children than women without child death experience. 19% of respondents were ever users of contraception, with women of low parity the least likely ever to have used contraception.  相似文献   
286.
287.
288.
289.
290.
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