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   18177篇
  免费   1270篇
各国政治   787篇
工人农民   885篇
世界政治   1282篇
外交国际关系   602篇
法律   12603篇
中国共产党   2篇
中国政治   104篇
政治理论   3093篇
综合类   89篇
  2023年   91篇
  2021年   111篇
  2020年   456篇
  2019年   483篇
  2018年   626篇
  2017年   630篇
  2016年   707篇
  2015年   532篇
  2014年   584篇
  2013年   1940篇
  2012年   521篇
  2011年   537篇
  2010年   550篇
  2009年   576篇
  2008年   532篇
  2007年   521篇
  2006年   544篇
  2005年   455篇
  2004年   450篇
  2003年   380篇
  2002年   418篇
  2001年   681篇
  2000年   623篇
  1999年   485篇
  1998年   243篇
  1997年   175篇
  1996年   195篇
  1995年   194篇
  1994年   178篇
  1993年   182篇
  1992年   310篇
  1991年   316篇
  1990年   298篇
  1989年   277篇
  1988年   309篇
  1987年   266篇
  1986年   321篇
  1985年   318篇
  1984年   248篇
  1983年   228篇
  1982年   181篇
  1981年   155篇
  1980年   147篇
  1979年   224篇
  1978年   120篇
  1977年   93篇
  1975年   95篇
  1974年   124篇
  1973年   85篇
  1972年   78篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
891.
Sixty-eight college students listed the factors they consider or would consider when making the following commitments: choosing courses, choosing a major, choosing a career, choosing a friend, choosing a romantic partner, and choosing a lifelong partner. In addition, subjects provided their own definition ofcommitment in an unstructured essay. Subjects listed more factors, more distinct types of factors, and more original factors for interpersonal commitments than for academic/vocational commitments. There were few gender differences found in these measures, contradicting the idea that men and women think differently about different commitments. In addition, few gender or class year differences were found in the themes present in the essay definingcommitment. Conceptions of commitment, as described in essays, predicted thinking about specific commitments only slightly.Received Ph.D. in Psychology and M.S.E. in Computer Science from the University of Pennsylvania, and has research interests in the areas of cognitive development and reasoning and decision making.Received Ph.D. in Counseling and Guidance from the University of Wisconsin, Madison, and has research interests in adolescent development and adolescent psychopathology.  相似文献   
892.
In an attempt to delay hatching without affecting their viability, the eggs ofLatheticus oryzae W. were subjected to cold treatment at 5° for varying periods and at different stages of their development. A small dose of 0.5 krad of gamma radiation was also given at each of those temperature treatments. Most of the eggs hatched at 30° following low-temperature exposures of 1 and 2 days. There was a significant decrease in hatch as the exposure period increased further (P<0.05). An egg exposure to 5° also led to an increase in egg period and the increase was nearly equal to the period of cold exposure. Radiation did not alter the situation.
Zusammenfassung Kühllagerung ist eine der gebr?uchlichsten Methoden für die Aufbewahrung von Insekteneiern. Um die optimalen Bedingungen für eine Vorratshaltung zu bestimmen, wurden 0–1 d alte Eier vonL. oryzae Temperaturen von 5° w?hrend 1–7 d ausgesetzt, nachdem sie verschieden lange bei 30° gehalten waren. Eine kleine Dosis von 0.5 krad Gammabestrahlung wurde bei jeder Temperaturbehandlung ebenfalls gegeben. Alle Eiproben wurden nach den verschiedenen K?ltebehandlungen in 30° zurückgebracht und die Wirkung auf Schlüpfprozentsatz und Eidauer bestimmt. Die Eidauer nahm zu, wenn die Eier bei 5° gehalten wurden, was anzeigt, da? die Embryogenese bei 5° unterdrückt wurde. Die Lebensf?higkeit der Eier wurde nicht beeintr?chtigt bei einer 5°-Einwirkungsdauer von 2 d, nahm aber bei weiterer Verl?ngerung der Expositionsdauer ab. Nur etwa 37% der Eier schlüpften (44,1% der Kontrolleier) nach 7-t?giger K?ltebehandlung. Bestrahlung beeinflu?te weder das Schlüpfen noch die Entwicklungsdauer.
  相似文献   
893.
In 1982, disabled workers who came on the social security disability insurance rolls from mid-1980 to mid-1981 had median monthly incomes of less than $500 if they were unmarried and less than $1,300 if they were married. These median monthly income levels, which include the income of a spouse and minor children if present, are roughly half those of the noninstitutionalized population aged 25-64. Social security benefits are the most important source of income for disabled workers and their families: They account for 40 percent of the total family income of married disabled workers and 65 percent of the total income of unmarried disabled workers. Social security benefits provide at least half of all income for more than 80 percent of unmarried disabled-worker beneficiaries and for 50 percent of the married beneficiaries. For married disabled-worker beneficiaries, earnings of the spouse are the second most important income source. Spousal earnings account for 28 percent of total income. Pensions and asset income each account for about 10 percent of total income for these married beneficiaries. Earnings are not an important source of income for unmarried disabled-worker beneficiaries for whom they amount to only about 3 percent of total income. Pensions, asset income, and public transfers each account for about 10 percent of total income of the unmarried beneficiaries.  相似文献   
894.
895.
896.
897.
A distribution of income between rulers and subjects can be derived as an equilibrium of violence, rather than from considerations of marginal products of owned factors of production. Society is organized in ranks, and the occupants of each rank are provided with incomes just sufficient that obedience is preferable to rebellion. To incorporate such considerations into a model, it is necessary to recognize phenomena that are normally excluded from economic analysis: combat, the mortality rate (from natural causes and from violence) as a component of the utility function, and a rudimentary technology of control.  相似文献   
898.
899.
In 1983 the Government of Kenya embarked on an accelerated programme of decentralization known as ‘District Focus’. This exercise in devolution is aimed at promoting more effective and efficient use of scarce domestic resources through efforts to strengthen planning capacity at the district level, improve horizontal integration among operating ministry field agents, and expand authority to district heads of operating ministries for managing financial and procurement aspects of local project implementation. Given the importance of this initiative to the economic growth of Kenya and the current search for administrative reforms that could help accelerate rural development in Africa, District Focus merits close attention by development experts. This article reviews the historical background, content, and implementation progress of District Focus.  相似文献   
900.
Singapore is an island state with no formal lower tier of government. The network of consultation and mobilization created after Independence in 1959 is now raising important issues of consensus and compliance. Twenty-five years of continuous one-party rule offer opportunities to evaluate the working of the mechanisms of integration and participation. In the late 1980s the highly urbanized, multi-ethnic society is placing new demands on the government, and questions of decentralization and feedback are high on the political agenda.  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