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   74580篇
  免费   3014篇
各国政治   4543篇
工人农民   3026篇
世界政治   6581篇
外交国际关系   3883篇
法律   36599篇
中国共产党   11篇
中国政治   769篇
政治理论   21231篇
综合类   951篇
  2021年   417篇
  2020年   1175篇
  2019年   1522篇
  2018年   1742篇
  2017年   2051篇
  2016年   2227篇
  2015年   1834篇
  2014年   2116篇
  2013年   10609篇
  2012年   1769篇
  2011年   1914篇
  2010年   1916篇
  2009年   2118篇
  2008年   1913篇
  2007年   1912篇
  2006年   2038篇
  2005年   1935篇
  2004年   1814篇
  2003年   1658篇
  2002年   1659篇
  2001年   2056篇
  2000年   1751篇
  1999年   1520篇
  1998年   1217篇
  1997年   1061篇
  1996年   1019篇
  1995年   984篇
  1994年   1021篇
  1993年   1018篇
  1992年   1140篇
  1991年   1184篇
  1990年   1097篇
  1989年   1146篇
  1988年   1110篇
  1987年   1129篇
  1986年   1136篇
  1985年   1159篇
  1984年   1048篇
  1983年   1109篇
  1982年   957篇
  1981年   910篇
  1980年   722篇
  1979年   809篇
  1978年   638篇
  1977年   582篇
  1976年   543篇
  1975年   463篇
  1974年   466篇
  1973年   460篇
  1972年   407篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
951.
952.
953.
954.
955.
956.
This article builds a composite index, the Central American Integration Index (IIC-AMPI), to measure economic integration. This index utilises a robust methodology and conceptual framework. The study shows that IIC-AMPI is responsive to variable changes and resistant to outliers. The findings indicate that the Deep Integration Process initiative dominates the current integration trend, as seen in the regional average score from 2015 to 2017, aligning with Guatemala and Honduras. Nicaragua demonstrates the most consistent progress, while Panama lags behind. The evidence supports the Customs Union as Central America's future integration path, highlighting the index's ability to capture the dynamic reality of economic integration.  相似文献   
957.
Measuring School-Related Stressors in Adolescents   总被引:2,自引:0,他引:2  
Some 1620 high school students responded to 68 items that measure adolescent stressors. Thirty-five of the items were based on J. P. Kohn and G. H. Frazer's Academic Stress Scale [1(1986) An Academic Stress Scale: Identification and Rated Importance of Academic Stressors, Psychological Reports, Vol. 59, pp. 415–426] developed in the United States, while the remaining 33 items were developed from P. Strutynski's [(1985) A Survey of Queensland Year 10, 11 and 12 Student Attitudes to Schools and Schooling, State Planning Committee, International Youth Year, Brisbane] lists of the most frequently named problems of 2336 Australian high school students. Confirmatory Factor Analysis was used to test and develop a measurement model developed from an extensive review of previous scales. The High School Stressors Scale emerged from the analytic process and measures nine school-related stressors. For researchers focusing on school-related problems and stressors among adolescents, the HSSS promises to be a very useful instrument. It has sound construct and predictive validity and adequate reliability, as demonstrated by the goodness-of-fit indices the squared multiple correlations.  相似文献   
958.
The aims of this study were (1) to compare the age-related expectations of parents and adolescents concerning the timing of achievement in a number of developmental tasks, (2) to examine whether personal characteristics of the adolescent affect developmental expectations, and (3) to examine whether discrepancies between the adolescents and the parents expectations are related to the amount of parent-adolescent conflict. The sample consisted of 508 families with adolescents (12–18 years old). During a home visit, a battery of questionnaires was administered individually to mothers, fathers, and adolescents. A new 24-item instrument to assess expectations for adolescents mastery of developmental tasks was developed for this study. Analyses showed that when the expectations of adolescents and those of their parents are compared at aggregate level, parents consistently indicate later ages for the achievement of developmental tasks than adolescents. Although parents have later timetables, parents and adolescents have strikingly similar views of the sequence in which achievement of developmental tasks should occur. The adolescents age appears to be the most potent predictor of developmental timetables, followed by gender, pubertal timing, and temperament, respectively. The amount of conflict within the parent-adolescent relationship was associated with differences in developmental expectations. The utility of the new instrument for research and clinical work is discussed.This research was supported by a grant from the Ministry of Health and Culture (PCOJ).  相似文献   
959.
960.
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