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   8907篇
  免费   293篇
各国政治   581篇
工人农民   419篇
世界政治   654篇
外交国际关系   402篇
法律   5355篇
中国政治   44篇
政治理论   1682篇
综合类   63篇
  2021年   64篇
  2020年   133篇
  2019年   171篇
  2018年   226篇
  2017年   263篇
  2016年   270篇
  2015年   186篇
  2014年   246篇
  2013年   1089篇
  2012年   240篇
  2011年   231篇
  2010年   196篇
  2009年   184篇
  2008年   244篇
  2007年   269篇
  2006年   237篇
  2005年   189篇
  2004年   197篇
  2003年   200篇
  2002年   161篇
  2001年   298篇
  2000年   264篇
  1999年   235篇
  1998年   111篇
  1997年   85篇
  1996年   77篇
  1995年   77篇
  1994年   81篇
  1993年   76篇
  1992年   127篇
  1991年   164篇
  1990年   159篇
  1989年   145篇
  1988年   150篇
  1987年   171篇
  1986年   160篇
  1985年   152篇
  1984年   135篇
  1983年   122篇
  1982年   84篇
  1981年   91篇
  1980年   68篇
  1979年   127篇
  1978年   86篇
  1977年   73篇
  1975年   83篇
  1974年   90篇
  1973年   83篇
  1972年   60篇
  1971年   59篇
排序方式: 共有9200条查询结果,搜索用时 46 毫秒
151.
152.
153.
The environment facing hospitals, generally supportive until the 1970s, may now be characterized as complex, turbulent, and constrained. In response to such environmental conditions, hospitals have adopted new strategies and structures. The strategies, described as corporate rationalization, have led away from the traditional structure of freestanding, autonomous hospitals and toward the formation of multi-institutional systems. These systems are designed to provide sufficient strength to cope with the environment, to acquire scarce and valued resources, to allow organizational stability, to achieve organizational purpose, to enable growth and/or survival, and to enhance market position. The impact of multi-hospital systems is viewed in two major areas: acquisition, retention, and utilization of economic and human resources, and organizational, political, and social factors.  相似文献   
154.
INTRODUCTORY GUIDE TO MIDDLE EASTERN AND ISLAMIC BIBLIOGRAPHY. (Middle East Libraries Committee Research Guides, 5.) Edited by PAUL AUCHTERLONIE. Oxford, Middle East Libraries Committee, 1990. v, 84pp. £9.50.

SUFI WOMEN. By JAVAD NURBAKHSH. Translated by L. Lewisohn. Rev. ed., London & New York, Khaniqahi‐Nimatullahi Publications, 1990. 263pp. 8 illustrations. £7.95.

WHO'S WHO IN THE ARAB WORLD 1990–1991. Tenth edition, thoroughly revised and completed. München, New York, London, Paris, K.G. Saur, for Publitec Publications, 1990. 927 pp. £180.00

INVENTARIO DE FOLLETOS: SECCIÓN DE ÁFRICA Y MUNDO ÁRABE DE LA BIBLIOTECA NACIONAL, I (CAJAS 7000 A 7021). By JAVIER GÓMEZ LÓPEZ & others. Madrid, Biblioteca Nacional, 1989. 124pp.

BIBLIOGRAFIA DE LA LITERATURA HISPANO‐ARABE. Compiled by MARIA JESUS RUBIERA MATA. Alicante, Universidad de Alicante, 1988. 75pp. Ptas. 566.‐

ESTUDIOS ONOMÁSTICO‐BIOGRÁFICOS DE AL‐ANDALUS, I. Edited by MANUELA MARlN. Madrid, CSIC, Instituto de Filología, Departamento de Estudio Árabes, 1988. 610,[2]pp.

ESTUDIOS ONOMÁSTICO‐BIOGRÁFICOS DE AL‐ANDALUS, II. Edited by MARlA LUISA ÁVILA. Granada, CSIC, Escuela de Estudios Árabes, 1989. 342,[2]pp.

AL‐ADAB AL‐TÜNISI AL‐MU'ASIR. By JEAN FONTAINE. Tunis, al‐Dar al‐Tūnisiyya li‐1‐Nashr, 1989. 191pp. TD3.200.

ENGLISH‐PERSIAN DICTIONARY OF LEGAL AND COMMERCIAL TERMS. Compiled By K.FAHIM, J. HABIBION and F. VITTOR. Leiden, Brill, 1989. 81pp. Hfl 150.

FLORA OF EASTERN SAUDI ARABIA. By JAMES P. MANDAVILLE. London, Kegan Paul International, in association with the National Commission for Wild Life Conservation and Development, Riyadh, 1990. x, 482pp. 200 colour ills. £95.00.  相似文献   

155.
Deoxyribonucleic acid (DNA) was isolated from a number of spongy and compact human bone tissue specimens, and the yield was estimated on a "per milligram of starting tissue" basis. DNA was, in addition, isolated from a number of corresponding blood and bone tissue specimens. Spectrophotofluorometry and ethidium bromide visualization on minigels were used to estimate the quantity and degree of degradation of DNA. The DNA from several blood-bone pairs is shown to give concordant restriction fragment length polymorphism (RFLP) typing results by two different typing protocols with five different single-locus probes. DNA from several additional blood-bone pairs is shown to give concordant results for human leucocyte antigen (HLA)-DQ alpha phenotypes following polymerase chain reaction (PCR) amplification and hybridization to specific allele-specific oligonucleotide (ASO) probes, and for the variable numbers of tandem repeats (VNTR) length polymorphisms 3' to the human apolipoprotein B (APOB) gene following PCR amplification with specific primers and analysis of the products by electrophoresis and ethidium bromide visualization.  相似文献   
156.
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   
157.
158.
159.
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   
160.
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   
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