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   15677篇
  免费   501篇
各国政治   559篇
工人农民   1276篇
世界政治   677篇
外交国际关系   568篇
法律   9793篇
中国政治   40篇
政治理论   3228篇
综合类   37篇
  2020年   174篇
  2019年   192篇
  2018年   1450篇
  2017年   1405篇
  2016年   1245篇
  2015年   285篇
  2014年   209篇
  2013年   829篇
  2012年   356篇
  2011年   1083篇
  2010年   1206篇
  2009年   819篇
  2008年   900篇
  2007年   841篇
  2006年   185篇
  2005年   227篇
  2004年   360篇
  2003年   309篇
  2002年   170篇
  2001年   314篇
  2000年   258篇
  1999年   232篇
  1998年   111篇
  1997年   78篇
  1996年   88篇
  1995年   112篇
  1994年   113篇
  1993年   92篇
  1992年   154篇
  1991年   162篇
  1990年   147篇
  1989年   160篇
  1988年   126篇
  1987年   143篇
  1986年   129篇
  1985年   135篇
  1984年   112篇
  1983年   125篇
  1982年   89篇
  1981年   83篇
  1980年   59篇
  1979年   114篇
  1978年   77篇
  1977年   65篇
  1976年   51篇
  1975年   47篇
  1974年   55篇
  1973年   58篇
  1972年   44篇
  1968年   41篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
Toxicologic findings in the USS Iowa disaster.   总被引:5,自引:0,他引:5  
The toxicologic results from the 47 victims of the explosion on the USS Iowa are presented. Good correlation between carboxyhemoglobin saturations and cause of death was found. There were no correlations between blood cyanide concentrations and causes of death. Volatile analysis suggested postmortem ethanol production rather than antemortem ethanol ingestion. No drugs except nicotine were detected in any of the victims.  相似文献   
92.
93.
The impact of high temperatures (24 to 39 degrees C) and low to moderately high humidities (20 to 70%) on the applicability of TLC systems for drug identification was studied during a 6 month climatologic cycle in Burkina Faso (West Africa). In general, the Rf values as observed on the plates were found to be substantially affected as compared with values obtained at temperate climates. Some TLC systems were more affected than others and the largest deviations of up to 30 Rf units were at low humidities. Tropical conditions also had a negative effect on the reproducibility of Rf values. However, when an Rf-correction procedure was applied, using reference mixtures of known drugs on each plate, accuracy as well as reproducibility of the resulting Rfc values were drastically improved and data thus corrected were found to be compatible with existing TLC data bases developed under moderate climatological conditions. The impact of high to extremely high humidities (70 to 100%) remains to be investigated.  相似文献   
94.
Hazardous waste management poses increasing problems for Canadian provinces and American states, given the vast quantities and types of wastes generated and the virtual inability to open new storage, treatment, or disposal facilities. The Canadian experience is very similar to the American one in many respects, except for the fact that three provinces (Alberta, Manitoba, and Quebec) have devised alternative approaches to siting that appear successful in moving beyond the political gridlock so common on this issue. In each of these cases, traditional, top-down approaches to siting have been eschewed in favor of a more comprehensive approach that includes extensive public participation, economic and social compensation packages, formal partnerships between public and private organizations, and direct links between siting proposals and other aspects of waste management, including waste reduction, recycling, and export/import control.  相似文献   
95.
The increased risk of child maltreatment in the presence of domestic violence is well documented, but much remains unknown about factors that modify this relationship. This study investigates the roles of risk and protective factors in the relationship between domestic violence and being reported to the Department of Social Services for child maltreatment. Consistent with the literature, we find a significant overlap between domestic violence and maltreatment. Young maternal age, low education, low income, and lack of involvement in a religious community add to the risk for maltreatment associated with domestic violence. Separation between the maternal caregiver and her partner significantly reduces the risk for maltreatment when domestic violence is reported. A significant reduction in the risk for maltreatment is also found with higher levels of support from the maternal caregiver reported by the child in the context of domestic violence.  相似文献   
96.
U.S. Supreme Court Justice Thurgood Marshall offered his opinion regarding the utility of public opinion polls as a tool for assessing the “evolving standards of decency” regarding capital punishment. His arguments became known as the Marshall hypotheses and spawned a considerable body of empirical testing. The three Marshall hypotheses are: (1) support for capital punishment is inversely associated with knowledge about it, (2) exposure to information about capital punishment produces sentiments in opposition to capital punishment, but (3) exposure to information about capital punishment will have no impact on those who support it for retributive reasons. The results of previous tests of these hypotheses were somewhat mixed but supportive. None of these studies, however, examined the effects of change in knowledge levels with changes, if any, in death penalty attitudes and beliefs as needed for a more complete test of the Marshall hypotheses. The present study addressed this shortcoming. The results provided mixed support for these three hypotheses. That is, death penalty supporters were somewhat less informed than death penalty opponents; exposure to death penalty information and knowledge gains tended to be associated with attitudinal change in a directions suggested by these hypotheses; but, retributivists' attitudes toward and beliefs about capital punishment were not any more resistant to change than were the attitudes and beliefs of non-retributivists.  相似文献   
97.
Conducting child custody evaluations is one of the most complex, challenging, and sometimes risky professional endeavors that a mental health professional can perform. This article examines the professional and personal challenges which may be encountered by the evaluator. In addition to discussing the role requirements and need to maintain awareness of bias and countertransference, challenges such as coping with state board or ethics complaints and possible risks to personal safety are also addressed. Suggestions for risk management and coping with the demands of these assessments are offered, as well as the benefits and rewards of engaging in this important work.  相似文献   
98.
In two recent cases, Grutter v. Bollinger, 539 U.S. 306. (2003) and Gratz v. Bollinger, 539 U.S. 244. (2003), the Supreme Court held that the Equal Protection Clause permitted state schools to use race-sensitive admissions in order to obtain the educational benefits that flow from a diverse student body. The diversity-based argument for race-sensitive admissions, scholarships, awards, and other opportunities at universities should have been rejected because it does not consider the full range of costs and benefits and because the more narrow educational effects probably weigh against such programs. However, this does not suggest that applicants’ race, ethnicity, and gender should be ignored. Rather the same consideration that led to the defeat of the diversity argument, i.e., reasoning capacity, supports the consideration of demographic factors. However, attention to such factors further undermines the consequentialist case for affirmative action.  相似文献   
99.
This article reports the results of a study of the antecedents of long-term success in community mediation. Seventy-three mediation sessions were recorded and content analyzed. The participants were interviewed at two points: immediately after mediation and 4 to 8 months later. No relationship was found between the quality of the agreements—i.e., the extent to which they solved immediate problems- and long-term success as measured by compliance, improved relations between the parties, and the absence of new problems. On the other hand, joint problem solving by the disputants was related to complainant perceptions of improved relations with the other party. Also respondent perceptions that the mediation had been fair and that all the problems had come out were related to all aspects of long-term success in the eyes of the complainant. The latter results support a procedural justice analysis of mediation and underline the importance of mediator attention to the respondent.  相似文献   
100.
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