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   21235篇
  免费   627篇
  国内免费   5篇
各国政治   887篇
工人农民   926篇
世界政治   1511篇
外交国际关系   734篇
法律   13415篇
中国共产党   6篇
中国政治   191篇
政治理论   4011篇
综合类   186篇
  2021年   120篇
  2020年   285篇
  2019年   365篇
  2018年   453篇
  2017年   492篇
  2016年   504篇
  2015年   359篇
  2014年   411篇
  2013年   2027篇
  2012年   561篇
  2011年   601篇
  2010年   499篇
  2009年   524篇
  2008年   632篇
  2007年   673篇
  2006年   642篇
  2005年   581篇
  2004年   585篇
  2003年   584篇
  2002年   509篇
  2001年   894篇
  2000年   761篇
  1999年   614篇
  1998年   317篇
  1997年   231篇
  1996年   248篇
  1995年   219篇
  1994年   241篇
  1993年   232篇
  1992年   410篇
  1991年   461篇
  1990年   442篇
  1989年   390篇
  1988年   406篇
  1987年   377篇
  1986年   403篇
  1985年   362篇
  1984年   308篇
  1983年   293篇
  1982年   226篇
  1981年   257篇
  1980年   164篇
  1979年   242篇
  1978年   163篇
  1977年   130篇
  1976年   119篇
  1975年   154篇
  1974年   167篇
  1973年   146篇
  1972年   133篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
211.
212.
A 1990 report prepared by the Office of Inspector General estimated that as much as $1 billion is lost to the Medicare program annually because (i) secondary payor situations are not detected and (ii) insurance companies often do not pay when they are required to be the primary payors. Office of Inspector General, No. A-09-98-00151, April 1990, Medicare and Medicaid Guide (CCH) [symbol: see text] 39,112, at 25,649. In order to better enforce the MSP provisions, suggestions have been made at the Congressional level to impose sanctions against providers who demonstrate a pattern of inappropriate billing practices such as double billing, repeated failures to screen beneficiaries for other insurance coverage, and the repeated submission to Medicare of bills that should be submitted to another payor. (See the Subcommittee Report on erroneous payments under the MSP program, supra.) Although authority for such sanctions has yet to be adopted, given the fiscal problems currently plaguing the federal government, providers can expect increased enforcement of the MSP provisions as a means of reducing Medicare costs, and should review their screening and billing practices accordingly.  相似文献   
213.
Recent theory views adolescent behavior as nested in an ongoing system of family relationships. In keeping with this focus, differences in family functioning of high vs. low identity achievement youth were examined and variables to account for differing identity levels were explored. However, the hypothesized relationship (Circumplex Model) between family type and communication was also examined. Subjects were 411 male students, 18–24 years of age, belonging to intact nuclear middle-class homes, who resided with parents in urban areas. Measures used were the Identity Achievement Scale, Family Adaptability and Cohesion Evaluation Scale, and the Parent-Adolescent Communication Scale. Results supported an association between balanced family type and effective communication (p.001). Significant differences in the family types were found (p.001), with high identity subjects belonging to balanced families, experiencing more openness (p.01) and less problems (p.01) in communicating with parents. Openness with father, mother, and problems with father emerged as significant discriminants. There are important implications for counselling and therapy with youth, placing family at the center of the psychosocial milieu influencing their development.Received Ph.D. from H.P. University. Research interests: adolescent psychosocial development, youth, identity, and family influences.Received M.A.; Ph.D. from Boston University; Panjab University. Research interests: family interiors, women studies, life stress, self image (DAP), sexuality, myths, holistic healing, and tribal women.  相似文献   
214.
215.
216.
217.
218.
In this article we examine how increasing the reimbursement of physicians and expanding Medicaid eligibility affect access to care for children in Cook County, Illinois, which overlies Chicago. Using Medicaid claims and other data at the zip-code level, we compare the places where Medicaid children live with the places where all the physicians who treat children and those who accept Medicaid patients have their practices. Our findings suggest that the recent changes in legislation are unlikely to benefit extremely poor children, who are more likely to live in depressed inner-city areas, where there are few physicians. "Near-poor" children whose homes are dispersed throughout the county, who are now eligible for Medicaid as a result of the recent changes, are likely to see improvements in their access to care. Further changes in policy, aimed at enhancing the capacity of institutions providing care, could improve access for the children of the inner city.  相似文献   
219.
220.
The Iran-Contra affair is an example of the type of event that is expected to give rise to a rally of public opinion behind the president. However, the public's response to this event, uncharacteristically, was a sharp decrease in support for President Reagan. This case study constitutes an attempt to explore the sources of the public opinion response to foreign policy events. Statements of political elites, news coverage and commentary, and public opinion assessments are examined to test the patriotism, priming, and opinion leadership explanations of the rally phenomenon. The actions of opinion leaders appears to provide the best explanation of the differential public response to the Iran-Contra affair.  相似文献   
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