全文获取类型
收费全文 | 12165篇 |
免费 | 308篇 |
专业分类
各国政治 | 432篇 |
工人农民 | 527篇 |
世界政治 | 741篇 |
外交国际关系 | 324篇 |
法律 | 7856篇 |
中国政治 | 75篇 |
政治理论 | 2426篇 |
综合类 | 92篇 |
出版年
2020年 | 113篇 |
2019年 | 162篇 |
2018年 | 279篇 |
2017年 | 241篇 |
2016年 | 309篇 |
2015年 | 187篇 |
2014年 | 201篇 |
2013年 | 984篇 |
2012年 | 348篇 |
2011年 | 357篇 |
2010年 | 227篇 |
2009年 | 296篇 |
2008年 | 285篇 |
2007年 | 285篇 |
2006年 | 283篇 |
2005年 | 619篇 |
2004年 | 334篇 |
2003年 | 275篇 |
2002年 | 252篇 |
2001年 | 442篇 |
2000年 | 375篇 |
1999年 | 305篇 |
1998年 | 163篇 |
1997年 | 129篇 |
1996年 | 140篇 |
1995年 | 134篇 |
1994年 | 138篇 |
1993年 | 137篇 |
1992年 | 255篇 |
1991年 | 272篇 |
1990年 | 269篇 |
1989年 | 281篇 |
1988年 | 250篇 |
1987年 | 247篇 |
1986年 | 287篇 |
1985年 | 273篇 |
1984年 | 237篇 |
1983年 | 228篇 |
1982年 | 153篇 |
1981年 | 129篇 |
1980年 | 116篇 |
1979年 | 162篇 |
1978年 | 95篇 |
1977年 | 115篇 |
1976年 | 96篇 |
1975年 | 82篇 |
1974年 | 112篇 |
1973年 | 93篇 |
1972年 | 92篇 |
1971年 | 85篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
261.
262.
Trisha R. Miller Paul J. Handal Frank H. Gilner John F. Cross 《Journal of family violence》1991,6(4):351-363
A number of social and psychological factors present in most adolescent parents place them at high risk for abusive behavior toward their children. However, current child abuse potential measures do not include adolescent samples as part of the psychometric data base. Consequently, the purpose of this study was twofold: (1) to investigate whether a Black adolescent sample would perform differently than an adult nonabusing sample on the Child Abuse Potential Inventory (CAP), and (2) to examine the relationship between history of abuse or witnessing violence to scores on the CAP. Results revealed that Black adolescents scored significantly higher than the adult normative sample on the CAP; consequently, cutoff scores need to be empirically established for adolescents. Additional analyses indicated that a history of abuse, as well as a history of witnessing violence, are associated with a high potential for abuse. 相似文献
263.
When dying is all that awaits them, more and more people are choosing certain death now rather than uncertain life on medical support systems. But the decision seldom comes easy, as a Newsweek reporter discovers during three weeks with the doctors, nurses, patients and families in an intensive-care ward. A best-selling guide to suicide fires debate over when it is right to let life go--and who should make that choice when the patient no longer can. 相似文献
264.
Corona Vazquez R 《Estudios demográficos y urbanos》1991,6(1):33-68, 215-6
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
265.
266.
267.
268.
Rizk IA Stokes CS Nelson MR 《Studies in Comparative International Development (SCID)》1982,17(2):74-86
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
269.
270.