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   82827篇
  免费   3335篇
  国内免费   5篇
各国政治   4744篇
工人农民   3256篇
世界政治   7057篇
外交国际关系   4060篇
法律   43270篇
中国共产党   19篇
中国政治   830篇
政治理论   21962篇
综合类   969篇
  2021年   443篇
  2020年   1220篇
  2019年   1584篇
  2018年   1931篇
  2017年   2209篇
  2016年   2404篇
  2015年   1904篇
  2014年   2163篇
  2013年   10953篇
  2012年   2005篇
  2011年   2254篇
  2010年   2106篇
  2009年   2284篇
  2008年   2209篇
  2007年   2281篇
  2006年   2376篇
  2005年   2266篇
  2004年   2121篇
  2003年   1955篇
  2002年   1949篇
  2001年   2468篇
  2000年   2150篇
  1999年   1846篇
  1998年   1326篇
  1997年   1121篇
  1996年   1103篇
  1995年   1066篇
  1994年   1078篇
  1993年   1067篇
  1992年   1339篇
  1991年   1386篇
  1990年   1332篇
  1989年   1296篇
  1988年   1317篇
  1987年   1297篇
  1986年   1349篇
  1985年   1352篇
  1984年   1194篇
  1983年   1209篇
  1982年   997篇
  1981年   937篇
  1980年   752篇
  1979年   892篇
  1978年   701篇
  1977年   612篇
  1976年   560篇
  1975年   531篇
  1974年   555篇
  1973年   525篇
  1972年   453篇
排序方式: 共有10000条查询结果,搜索用时 234 毫秒
51.
In 1991 the FCC implemented a price cap plan for local exchange carriers' interstate access service designed to deal with the regulatory boundaries problem arising from the breakup of AT&T in 1984. The experience with the price cap plan demonstrates the difficulty of predicting productivity growth accurately and makes clear that regulators cannot depend upon a pure price cap plan to keep prices within a reasonable range of costs. With periodic reviews to readjust plan parameters, however, a price cap plan can maintain the rate-of-return close to the target rate-of-return without diminishing the price cap plan's incentives for efficient production. A simple method of recalculating the X-factor based on the rate-of-return over the previous three years worked well in simulations. If this procedure had been used over the price cap period 1991 to 2000, prices would have been 20 percent lower and expenditures on LECs' telecommunications service subject to a price cap would have been $3.8 billion lower.  相似文献   
52.
The adjustment problems associated with sexual abuse, physical abuse, psychological maltreatment, neglect, and witnessing family violence during childhood were examined in three studies. Study 1 demonstrated significant overlap between maltreatment types in parent reports (N = 50) of maltreatment experiences of their child aged 5–12 years. Parental sexual punitiveness, traditionality, family adaptability and family cohesion significantly predicted scores on 4 maltreatment scales and children's externalizing behavior problems. Level of maltreatment predicted internalizing, externalizing, and sexual behavior problems. In Study 2, significant overlap was found between adults' retrospective reports (N = 138) of all 5 types of maltreating behaviors. Parental sexual punitiveness, traditionality, family adaptability, and family cohesion during childhood predicted the level of maltreatment and current psychopathology. Although child maltreatment scores predicted psychopathology, childhood family variables were better predictors of adjustment. Study 3 demonstrated that child maltreatment scores predicted positive aspects of adult adaptive functioning (N = 95).  相似文献   
53.
This paper considers technology transfer from a holistic perspective, defining and integrating all essential elements. Technology, technology ownership, and technology transfer are defined to enable practical management of the value of technology as an organizational asset. Concepts from value-chain movement of technology in commercial product development are used to develop a complete, detailed vision of technology transfer across corporate boundaries. Lessons enable development of a productive technology-transfer function that will speed evolution of technology to product and enable creation of new wealth.  相似文献   
54.
55.
There is widespread concern that higher education is being compromised by being turned into a ‘commodity’ to be ‘consumed’. This article represents an initial attempt to explore the trends in both the UK and US, and considers how the law has responded to them. It argues, however, that there is an important distinction to be drawn between ‘commodification’ and ‘consumerism’. Education has always been a commodity to be bought and sold; the true danger lies in the move to a ‘rights-based’ culture where students (and politicians) see education merely as something to be ‘consumed’ rather than as an activity in which to participate. Whilst the law seems thus far to have been something of a bulwark against this movement, it remains an open question as to whether this will continue to be the case if HEIs do not themselves act more proactively in challenging this damaging view of higher education.  相似文献   
56.
Weit weg und mittlerweile doch sehr nah liegt die Antarktis, wenn es um Klima- und Umweltschutz geht. Forschung und Tourismus strapazieren den au?ergew?hnlichen Naturraum. Der Beitrag zeigt auf, mit welchen Steuerungsans?tzen Deutschland seinen Verpflichtungen zum Antarktisschutz gerecht werden will. Ausgehend von einigen Informationen über den 6. Kontinent (A.) werden die unterschiedlichen Interessenkonflikte rund um Nutzung und Schutz der Antarktis illustriert (B.). Im Anschluss daran wird der zugeh?rige internationale und nationale Rechtsrahmen kurz vorgestellt (C.), ehe verschiedene Facetten des deutschen Ausführungsgesetzes n?her beleuchtet werden (D.). Flankierend wird neben dem Ordnungsrecht eine gute fachliche Praxis in Form eines Leitfadens als Element nichtrechtlicher Steuerung genutzt (E.). Der Beitrag schlie?t mit Fazit und Ausblick (F.).  相似文献   
57.
While the concepts of race and ethnicity have been abused historically, they are potentially invaluable in epidemiology and public health. Epidemiology relies upon variables that help differentiate populations by health status, thereby refining public health and health care policy, and offering insights for medical science. Race and ethnicity are powerful tools for doing this. The prerequisite for their responsible use is a society committed to reducing inequalities and inequities in health status. When this condition is met, it is irresponsible not to utilize these concepts.  相似文献   
58.
59.
60.
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