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   8346篇
  免费   219篇
各国政治   518篇
工人农民   341篇
世界政治   557篇
外交国际关系   327篇
法律   4930篇
中国共产党   1篇
中国政治   47篇
政治理论   1783篇
综合类   61篇
  2020年   89篇
  2019年   105篇
  2018年   147篇
  2017年   175篇
  2016年   180篇
  2015年   126篇
  2014年   154篇
  2013年   946篇
  2012年   169篇
  2011年   180篇
  2010年   172篇
  2009年   171篇
  2008年   212篇
  2007年   223篇
  2006年   235篇
  2005年   186篇
  2004年   176篇
  2003年   201篇
  2002年   180篇
  2001年   304篇
  2000年   259篇
  1999年   248篇
  1998年   112篇
  1997年   99篇
  1996年   84篇
  1995年   82篇
  1994年   89篇
  1993年   87篇
  1992年   135篇
  1991年   175篇
  1990年   171篇
  1989年   164篇
  1988年   168篇
  1987年   186篇
  1986年   176篇
  1985年   171篇
  1984年   147篇
  1983年   135篇
  1982年   98篇
  1981年   113篇
  1980年   83篇
  1979年   135篇
  1978年   95篇
  1977年   89篇
  1976年   61篇
  1975年   93篇
  1974年   91篇
  1973年   95篇
  1972年   59篇
  1971年   63篇
排序方式: 共有8565条查询结果,搜索用时 15 毫秒
171.
Narcotics "body packing" can be detected in abdominal X-rays by the ring shadow caused by air trapped in the packs. In a series of 82 cases admitted for abdominal X-ray in Helsinki, Finland, in 1982 through 1988, we encountered 9 (11.0%) true positives, 3 (3.6%) false positives, and 1 (1.2%) false negative. The false positives were due to the constipation often associated with the narcotics abuse. The false negative X-ray diagnosis was attributable to an inexperienced radiologist. False negatives may also be associated with packets containing marijuana, packs with few wrappings, aluminum-foil coated packs, and machine-packed narcotics. Searching for trapped air in radiographs, repeated X-raying by an experienced radiologist, use of computed tomography, or combined urinary drug screening may be applied to diminish false findings and to avoid unnecessary arrest for the purpose of fecal screening over several days.  相似文献   
172.
173.
174.
175.
The Equal Employment Opportunity Commission (EEOC) recently issued its final regulations on the Americans with Disabilities Act (ADA). Although the regulations offer some guidance for employers on how to comply with the Act, they fail to provide specific answers to the many complicated compliance questions that will surely arise. Further, the regulations are almost totally silent on certain critical issues related to insurance, workers' compensation, and potential conflicts between ADA obligations and terms of collective bargaining agreements. The EEOC has essentially left the resolution of many important ADA questions to case-by-case determination and the litigation process.  相似文献   
176.
The more flagrant aspects of Antisocial Personality Disorder (APD), particularly criminality, are thought to diminish or "burnout" after age 30. However, empirical evidence of burnout in clinically defined groups is lacking. This study explores burnout in a cohort of forensic psychiatric patients, aged 41 to 67, with clinically diagnosed DSM-III APD (N = 39). Conviction data revealed that criminality did appear to decline from age 27 onward, but not in a straightforward manner. Further, a significant portion of the cohort remained criminally active throughout most of their adult lives. Age did not appear to interact with crime class.  相似文献   
177.
178.
179.
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   
180.
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