全文获取类型
收费全文 | 17355篇 |
免费 | 1159篇 |
专业分类
各国政治 | 703篇 |
工人农民 | 833篇 |
世界政治 | 1127篇 |
外交国际关系 | 529篇 |
法律 | 12191篇 |
中国共产党 | 2篇 |
中国政治 | 104篇 |
政治理论 | 2936篇 |
综合类 | 89篇 |
出版年
2023年 | 76篇 |
2021年 | 86篇 |
2020年 | 427篇 |
2019年 | 445篇 |
2018年 | 562篇 |
2017年 | 577篇 |
2016年 | 656篇 |
2015年 | 503篇 |
2014年 | 532篇 |
2013年 | 1791篇 |
2012年 | 481篇 |
2011年 | 500篇 |
2010年 | 532篇 |
2009年 | 556篇 |
2008年 | 506篇 |
2007年 | 499篇 |
2006年 | 519篇 |
2005年 | 432篇 |
2004年 | 429篇 |
2003年 | 353篇 |
2002年 | 402篇 |
2001年 | 671篇 |
2000年 | 603篇 |
1999年 | 480篇 |
1998年 | 237篇 |
1997年 | 172篇 |
1996年 | 191篇 |
1995年 | 189篇 |
1994年 | 168篇 |
1993年 | 175篇 |
1992年 | 303篇 |
1991年 | 311篇 |
1990年 | 294篇 |
1989年 | 276篇 |
1988年 | 304篇 |
1987年 | 261篇 |
1986年 | 320篇 |
1985年 | 316篇 |
1984年 | 246篇 |
1983年 | 226篇 |
1982年 | 177篇 |
1981年 | 154篇 |
1980年 | 143篇 |
1979年 | 219篇 |
1978年 | 116篇 |
1977年 | 91篇 |
1975年 | 94篇 |
1974年 | 124篇 |
1973年 | 79篇 |
1972年 | 78篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
971.
Murphy AM 《Forensic science international》2005,154(2-3):210-213
Prehistoric Polynesian skeletal remains are frequently being recovered in New Zealand due to the increasing pace of urbanisation. Since such material must often be reinterred quickly, it is important that the sex of individuals be determined from the remains in a relatively short time. For this purpose, discriminant function analysis was utilised for sex determination of prehistoric adult New Zealand Polynesian femora (47 male and 44 female). Three measurements of the femoral head were taken and subjected to Statistical Package for the Social Sciences (SPSS) discriminant function analysis. For the discriminant functions derived, accuracy of sex determination ranged from 80.9% to 82.4%. Reduction in error over random assignment by sex ranged from 62% to 65%. 相似文献
972.
Steyn M 《Forensic science international》2005,151(2-3):279-287
In Southern Africa, human body parts are sometimes used for medicinal (muti) purposes. The human body is seen as being very powerful. Although ritual killing for this purpose is not common, some cases have been reported. This paper reports on an unusual muti murder, where the remains of two individuals were found in a medicine man's house. Three pots were found, two of which were constructed around human skulls. Various objects, such as coins, bullets, stones, human and animal bones were found inside the pots. They were decorated with beadwork, whistles, skin bangles, etc. Osteological analysis revealed that the human remains probably belonged to a young, white adult male individual, and a juvenile individual of Negroid descent. All associated objects probably have ritual significance, and some of these are discussed. 相似文献
973.
Renita?R.?Glaser M.?Lee?Van.?Horn Michael?W.?ArthurEmail author J.?David.?Hawkins Richard?F.?Catalano 《Journal of Quantitative Criminology》2005,21(1):73-102
Prevention science has produced information about risk and protective factors that predict adolescent drug use and related problem behaviors. This paper investigates the Communities That Care Youth Survey that measures multiple risk and protective factors. Using a sample of 172,628 students who participated in surveys administered in seven states in 1998, analyses were conducted to test the factor structure of these risk and protective factors and to test the equivalence of the factor models across five racial/ethnic groups (African Americans, Asians or Pacific Islanders, Caucasians, Hispanic Americans, and Native Americans), four grade levels (6th, 8th, 10th, and 12th) and both gender groups. Results support the construct validity of the surveys risk and protective factor scales and indicate that the measures are equally reliable across males and females and five racial/ethnic groups. Implications of these findings for science-based prevention planning are discussed. 相似文献
974.
975.
D M Wayte 《Journal - Forensic Science Society》1974,14(3):163-164
976.
977.
The technique of isoelectric focusing in ultra-thin polyacrylamide gels as a method of typing human red cell phosphoglucomutase (PGM1) has been studied. Typing was possible without the samples attaining true equilibrium focusing conditions. The isozyme patterns so obtained were clearly defined and free from distortion. The importance of assessing relative band intensities when interpreting the isozyme patterns is discussed. Our experience of using the technique to analyse casework material is described. 相似文献
978.
Although politicians, police, and others have often advocated the expansion of police employment in the effort to control crime, the empirical relationship between police employment and crime rates has seldom been systematically explored. This study incorporates variables which are causally related both to crime and police employment roles for the 252 northern and northeastern suburbs for which police employment and crime data are available for 1970–1972. Separate analyses of violent and property crime are undertaken, incorporating data on police employment as a causally related variable along with several other determinants of crime identified in earlier studies. The analysis suggests that police employment and crime rates are reciprocally related, and that these relationships offer more support for a “labeling” than a “deterrence” perspective. 相似文献
979.
980.