全文获取类型
收费全文 | 18469篇 |
免费 | 1243篇 |
专业分类
各国政治 | 784篇 |
工人农民 | 852篇 |
世界政治 | 1212篇 |
外交国际关系 | 600篇 |
法律 | 12800篇 |
中国共产党 | 2篇 |
中国政治 | 132篇 |
政治理论 | 3229篇 |
综合类 | 101篇 |
出版年
2023年 | 208篇 |
2021年 | 120篇 |
2020年 | 444篇 |
2019年 | 463篇 |
2018年 | 597篇 |
2017年 | 609篇 |
2016年 | 675篇 |
2015年 | 525篇 |
2014年 | 558篇 |
2013年 | 1925篇 |
2012年 | 520篇 |
2011年 | 528篇 |
2010年 | 565篇 |
2009年 | 596篇 |
2008年 | 536篇 |
2007年 | 534篇 |
2006年 | 537篇 |
2005年 | 455篇 |
2004年 | 456篇 |
2003年 | 368篇 |
2002年 | 427篇 |
2001年 | 686篇 |
2000年 | 635篇 |
1999年 | 503篇 |
1998年 | 251篇 |
1997年 | 196篇 |
1996年 | 203篇 |
1995年 | 204篇 |
1994年 | 178篇 |
1993年 | 186篇 |
1992年 | 318篇 |
1991年 | 324篇 |
1990年 | 312篇 |
1989年 | 289篇 |
1988年 | 318篇 |
1987年 | 283篇 |
1986年 | 331篇 |
1985年 | 330篇 |
1984年 | 257篇 |
1983年 | 238篇 |
1982年 | 185篇 |
1981年 | 161篇 |
1980年 | 151篇 |
1979年 | 228篇 |
1978年 | 122篇 |
1977年 | 97篇 |
1976年 | 79篇 |
1975年 | 102篇 |
1974年 | 129篇 |
1973年 | 83篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
851.
852.
853.
854.
855.
856.
The assumption that candidates make a difference to electoral outcomes in British general elections is tested through a comparison of the 1983 and 1987 general elections. Incumbent's Constituency-specific Vote Change (ICVC) between the June 1983 and June 1987 British general elections is measured by subtracting the average regional vote change for the incumbent's party from the constituency vote change registered by the incumbent. Regression analysis finds ICVC to be most significantly influenced in both the Labour and Conservative parties by the incumbent's length of tenure, displayed especially in the higher ICVC registered by first-term incumbents than by more senior incumbents. Variables indicating the security or insecurity of the seat in electoral terms are significantly related to ICVC in the Conservative but not in the Labour case. The findings for Labour indicate ICVC to be greater where electoral security is greater. This finding might be explained by successful Conservative party concentration on constituencies in which Labour incumbents appear to be vulnerable. 相似文献
857.
858.
859.
860.
Roger C. Katz Kris Mills Nirbhay N. Singh Al M. Best 《Journal of youth and adolescence》1995,24(1):117-131
This study compared AIDS knowledge and attitudes in public high school students (N=167), incarcerated delinquents (N=166), and emotionally disturbed (SED) adolescents (N=151). The response measure was a 50-item Acquired Immunodeficiency Syndrome (AIDS) questionnaire that was previously used by Bell et al., in their 1991 study of learning disabled adolescents. Although AIDS knowledge was moderately high in all three groups, widespread misunderstandings about disease transmission and awareness of high-risk groups and practices were noted. Knowledge scores were significantly higher in the public school sample than in the SED adolescents; moreover, they tended to be slightly higher (p<0.10) than the delinquent group as well. Teenagers with the severest emotional problems were by far the least informed. Age and race were also predictive of AIDS knowledge. Other results showed that delinquents were more permissive in their attitudes about sex, more inclined to disdain safe sex practices, and more likely to feel threatened by high-risk groups as well as powerless to protect themselves against AIDS. Generally speaking, the findings extend the work of other investigators on the needs for AIDS education in adolescents. The need is especially urgent in delinquent and emotionally disturbed youth who may require a more comprehensive intervention because of their greater knowledge deficits, propensity for high-risk practices, and tendency to deny or underestimate their own vulnerability.Received Ph.D. in clinical psychology from the University of Utah in Salt Lake City. Research interests include health behavior change and the treatment of anxiety and habit disorders. To whom correspondence should be addressed.Received M.A. degree in psychology from the University of the Pacific. Research interests include health behavior change and medical epidemiology.Received Ph.D. in psychology from the University of Auckland, Auckland, New Zealand. Research interests are in child and adolescent psychiatry and the delivery of mental health services.Received Ph.D. in biostatistics from the Medical College of Virginia. Research interests are in general linear models. 相似文献