全文获取类型
收费全文 | 26119篇 |
免费 | 1447篇 |
国内免费 | 5篇 |
专业分类
各国政治 | 1032篇 |
工人农民 | 1029篇 |
世界政治 | 1838篇 |
外交国际关系 | 797篇 |
法律 | 17758篇 |
中国共产党 | 7篇 |
中国政治 | 224篇 |
政治理论 | 4650篇 |
综合类 | 236篇 |
出版年
2020年 | 491篇 |
2019年 | 543篇 |
2018年 | 642篇 |
2017年 | 759篇 |
2016年 | 761篇 |
2015年 | 636篇 |
2014年 | 658篇 |
2013年 | 2505篇 |
2012年 | 667篇 |
2011年 | 767篇 |
2010年 | 841篇 |
2009年 | 814篇 |
2008年 | 728篇 |
2007年 | 737篇 |
2006年 | 787篇 |
2005年 | 662篇 |
2004年 | 641篇 |
2003年 | 667篇 |
2002年 | 583篇 |
2001年 | 996篇 |
2000年 | 806篇 |
1999年 | 706篇 |
1998年 | 368篇 |
1997年 | 282篇 |
1996年 | 286篇 |
1995年 | 286篇 |
1994年 | 322篇 |
1993年 | 299篇 |
1992年 | 507篇 |
1991年 | 546篇 |
1990年 | 510篇 |
1989年 | 476篇 |
1988年 | 488篇 |
1987年 | 424篇 |
1986年 | 490篇 |
1985年 | 465篇 |
1984年 | 413篇 |
1983年 | 381篇 |
1982年 | 308篇 |
1981年 | 303篇 |
1980年 | 241篇 |
1979年 | 303篇 |
1978年 | 210篇 |
1977年 | 176篇 |
1976年 | 156篇 |
1975年 | 189篇 |
1974年 | 191篇 |
1973年 | 159篇 |
1972年 | 145篇 |
1971年 | 143篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
901.
902.
Michelle Wierson Sarah D. Nousiainen Rex Forehand Amanda McCombs Thomas 《Journal of family violence》1992,7(1):9-18
Much attention has been paid to the nature of parent-adolescent relationships, with a frequent conclusion being that it is a time of marked disagreement between parents and their adolescents. However, other literature suggests that this time is not inherently conflictual. The purpose of this study was to examine agreement and disagreement between mothers, fathers, and adolescents on specific issues. Then, adolescent adjustment was assessed, and the degree to which it was a function of congruence with parents was examined. A modified version of the Issues Checklist was used to measure intrafamily agreement; the Revised Behavior Problem Checklist and the Harter Scale of Child's Actual Competence were completed by adolescents' social studies teachers to assess adolescent functioning. Relative to their parents, adolescents reported that they should make more decisions alone, while both mothers and fathers reported that decisions should be made jointly among all family members. Only father-adolescent congruence was found consistently to be related to adolescent functioning. Possible explanations for the present results and relevant issues pertaining to family agreement are discussed. 相似文献
903.
904.
Effects of positional restraint on oxygen saturation and heart rate following exercise 总被引:1,自引:0,他引:1
D T Reay J D Howard C L Fligner R J Ward 《The American journal of forensic medicine and pathology》1988,9(1):16-18
This report assesses the effects on peripheral oxygen saturation and heart rate that positional restraint induces when a person is prone, handcuffed, and "hog-tied." Peripheral oxygen saturation and heart rate were monitored at rest, during exercise, and during recovery from exercise for 10 adult subjects. The effects of positional restraint produced a mean recovery time that was significantly prolonged. Consequently, the physiological effects produced by positional restraint should be recognized in deaths where such measures are used. 相似文献
905.
The necessity of rapid objective appraisal of the suspicion of intracorporeal drug smuggling (body-packing) by effective methods of investigation in the course of the first criminal investigation department measures raises the questions of suitable and admissible methods. The proportion of undetected crimes in intracorporeal narcotic smuggling must be rated as very high according to the data of the Federal Criminal Investigation Department. In the present paper, the suitability of various imaging techniques for drug detection are reported in terms of their risk, practicability and costs. For this purpose, the value of digital radiography, two-spectra radiography and X-ray computer tomography as compared to conventional X-ray investigations is examined in human experiments. A reality-oriented narcotics dummy (glucose pressed hard in preservative) was developed and administered to nine volunteers per os with a variable initial alimentary situation. Four radiograms were taken at fixed times up to 12 hours after administration with each imaging technique. The highest rate of detection was attained with computer tomography. In contrast to the other methods, more than 90% of the body packs could be identified here. Nevertheless, an application in criminal investigation practice cannot be recommended owing to various disadvantages. The recovery rate of the remaining methods is between 20% and 25%. 相似文献
906.
907.
908.
Valeria Santoro Ph.D. Piercarlo Lozito D.D.S. Antonio De Donno Ph.D. Francesco Introna M.D. 《Journal of forensic sciences》2011,56(1):224-228
Abstract: This study was based on a morphometric analysis of bite marks starting from the quantitative definition of the anterior teeth by the geometric acquisition of the “injuries,” using bite marks impressed on pig skin and plastic. Each mark was photographed and acquired. A dedicated program automatically supplied the values of the shape factors and the areas of the pattern geometric figures. The values obtained for the homologous samples were compared to the heterologous values. Statistical comparison was made of the sets by linear regression, determining the correlation coefficient and the determination coefficient for each value. Results showed only 4.8% and 2% of overlap between homologous and heterologous values. This study was carried out in attempting to quantitatively define the anterior teeth of the human dentition and the procedure described and the results obtained support the advantage of morphometric studies and computer‐aided programs in this study of bite marks. 相似文献
909.
910.
Claudio A. Holzner 《拉美政治与社会》2007,49(2):87-122
Twenty years after governments across Latin America began implementing neoliberal reforms in earnest, concern is growing about their impact on the quality of democracy in the region. This article examines this issue in the case of Mexico by exploring how patterns of political participation, especially among the rural and urban poor, have changed since the implementation of free market reforms. It asks whether the institutional innovations associated with free market reforms make it easier or more difficult for the poor to participate in Mexico's political process. The answer is not encouraging. Despite democratic openings, the new linkages between the state and citizens established as a result of the transition to a free market development model stifle the voice of the poor not through the threat of force or coercion, but by creating obstacles and disincentives for political mobilization that affect the poor more severely than other groups. 相似文献