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   20086篇
  免费   661篇
  国内免费   5篇
各国政治   870篇
工人农民   818篇
世界政治   1484篇
外交国际关系   752篇
法律   12139篇
中国共产党   6篇
中国政治   173篇
政治理论   4306篇
综合类   204篇
  2020年   259篇
  2019年   317篇
  2018年   413篇
  2017年   490篇
  2016年   518篇
  2015年   370篇
  2014年   367篇
  2013年   2059篇
  2012年   552篇
  2011年   561篇
  2010年   492篇
  2009年   520篇
  2008年   600篇
  2007年   649篇
  2006年   628篇
  2005年   573篇
  2004年   558篇
  2003年   584篇
  2002年   528篇
  2001年   728篇
  2000年   624篇
  1999年   541篇
  1998年   333篇
  1997年   235篇
  1996年   236篇
  1995年   231篇
  1994年   254篇
  1993年   256篇
  1992年   388篇
  1991年   403篇
  1990年   389篇
  1989年   341篇
  1988年   374篇
  1987年   343篇
  1986年   371篇
  1985年   351篇
  1984年   285篇
  1983年   263篇
  1982年   224篇
  1981年   239篇
  1980年   162篇
  1979年   212篇
  1978年   159篇
  1977年   139篇
  1976年   119篇
  1975年   144篇
  1974年   154篇
  1973年   124篇
  1972年   114篇
  1969年   111篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
261.
262.
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   
263.
264.
265.
266.
267.
268.
This article examines inter-relationship between "centers" and "peripheries" within political, professional and health care systems. It seeks to determine which conditions tend to improve the capacity of public authorities to further such measures of effectiveness as access to, quality of, and complementarity of health care delivery. Examples are selected from the experience of the United States and West European countries.  相似文献   
269.
270.
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