全文获取类型
收费全文 | 13633篇 |
免费 | 416篇 |
专业分类
各国政治 | 761篇 |
工人农民 | 576篇 |
世界政治 | 1016篇 |
外交国际关系 | 554篇 |
法律 | 8160篇 |
中国共产党 | 2篇 |
中国政治 | 164篇 |
政治理论 | 2705篇 |
综合类 | 111篇 |
出版年
2023年 | 73篇 |
2020年 | 172篇 |
2019年 | 221篇 |
2018年 | 307篇 |
2017年 | 321篇 |
2016年 | 333篇 |
2015年 | 261篇 |
2014年 | 295篇 |
2013年 | 1526篇 |
2012年 | 341篇 |
2011年 | 451篇 |
2010年 | 313篇 |
2009年 | 359篇 |
2008年 | 366篇 |
2007年 | 352篇 |
2006年 | 354篇 |
2005年 | 273篇 |
2004年 | 322篇 |
2003年 | 337篇 |
2002年 | 253篇 |
2001年 | 544篇 |
2000年 | 512篇 |
1999年 | 428篇 |
1998年 | 204篇 |
1997年 | 160篇 |
1996年 | 164篇 |
1995年 | 149篇 |
1994年 | 167篇 |
1993年 | 157篇 |
1992年 | 264篇 |
1991年 | 256篇 |
1990年 | 269篇 |
1989年 | 248篇 |
1988年 | 276篇 |
1987年 | 275篇 |
1986年 | 253篇 |
1985年 | 244篇 |
1984年 | 224篇 |
1983年 | 228篇 |
1982年 | 141篇 |
1981年 | 116篇 |
1980年 | 122篇 |
1979年 | 150篇 |
1978年 | 112篇 |
1977年 | 89篇 |
1976年 | 96篇 |
1975年 | 84篇 |
1974年 | 86篇 |
1973年 | 74篇 |
1971年 | 73篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
31.
Although there has been speculation regarding the pervasiveness and nature of judicial decisions regarding life-sustaining medical treatment (LSMT), no attempt has been made to empirically assess their prevalence or the issues they address. An exploratory study utilizing a mail survey of a nationwide random sample (N = 905) of state trial court judges was conducted to provide initial information regarding this decision-making process. Twenty-two percent of the responding judges had heard at least one LSMT case, and judicial review did not appear endemic to particular states. The number of judges hearing LSMT cases dropped from 1975 to 1981 but has increased since then. Three major issues predominate: patient competency, appointment of a surrogate decisionmaker, and resolution of the ultimate issue of forgoing LSMT. Relatively few cases either contested a prior directive's validity or involved imposing sanctions for instituting or forgoing LSMT. Although subject to different interpretations, the results suggest the courts are having a significant impact on certain aspects of the LSMT decision-making process. However, the infrequency with which any one judge is called upon to make an LSMT decision causes concern about the judiciary's ability to respond in a timely and appropriate manner. With their potential for a profound effect on the actions of health care providers, greater attention to this decision-making process is warranted. 相似文献
32.
Poppy seed ingestion as a contributing factor to opiate-positive urinalysis results: the Pacific perspective. 总被引:2,自引:0,他引:2
C M Selavka 《Journal of forensic sciences》1991,36(3):685-696
The possible contribution of poppy seed foods to positive opiate urinalysis results, especially from foods available in the Pacific Rim area, has recently become an issue for the U.S. Army Forensic Toxicology Drug Testing Laboratory in Hawaii. To assess the likelihood of this possible contribution, seven different poppy seed food products were consumed by male and female volunteers, and urine specimens were collected at time increments up to either 24 or 72 h. Specimens were evaluated for opiates using Roche Abuscreen radioimmunoassay (RIA), and all RIA positive specimens were analyzed for morphine and codeine using gas chromatography/mass spectrometry (GC-MS). Poppy seed cake, bagels, muffins, and rolls did not contain sufficient quantities of poppy seeds to give rise to opiate positive specimens by U.S. Department of Defense (DOD) GC-MS cutoff levels (morphine = 4000 ng/mL, codeine = 2000 ng/mL), although a number of specimens were positive by National Institute on Drug Abuse (NIDA) cutoff levels (morphine and codeine = 300 ng/mL). However, ingestion of poppy seed streusel or Danish pastry led to confirmed morphine and codeine positive specimens, irrespective of the use of DOD or NIDA confirmation cutoff values. In addition, significant amounts of codeine were observed in a number of these specimens. These findings argue against the unqualified application of previously published quantitative guidelines for eliminating poppy seed ingestion as a possible cause for a positive opiate urinalysis result. 相似文献
33.
Research has indicated that school factors such as communal school organization and student bonding are predictive of school disorder, with greater communal organization and greater student bonding leading to less delinquency and victimization. Data from a nationally representative sample of 254 public, nonalternative, secondary schools were used to examine structural equation models representing hypothesized relationships among communal school organization, student bonding, and school disorder. The hypothesis that communally organized schools would have less disorder held true for teacher victimization and student delinquency, but not for student victimization. In addition, the hypothesis that the relationship between communal school organization and school disorder would be mediated by student bonding was supported for student delinquency, but not for teacher victimization. 相似文献
34.
Alexander M Holsinger Christopher T LowenkampEdward J Latessa 《Journal of criminal justice》2003,31(4):309
Offender assessment and classification is becoming an increasingly important part of correctional supervision and intervention. Over the last several decades, several different methods and “generations” of offender classification have emerged. Of most value appear to be third-generation, actuarial, dynamic risk/need assessments. With any new correctional strategy, however, there is a need to investigate the use of these risk/need assessments on offender subgroups in order to inform issues, such as reliability and prevalence of criminogenic risk factors. The present study utilized data that were gathered using the Level of Service Inventory-Revised (LSI-R). Results and comparisons of these assessments were investigated and presented for Native American and non-Native American offenders as well as male and female offenders. Discussion of the results, implications, and recommendations for further research are presented. 相似文献
35.
36.
37.
38.
This study examines the performance of chief federal prosecutors(U.S. attorneys) and their subsequent careers. In a sample of570 attorneys in office from 1969 to 2000, the length of prisonsentences is positively related to subsequent favorable careeroutcomes for U.S. attorneys. In contrast, conviction rates donot appear to affect the careers of U.S. attorneys. These resultsare consistent with longer total prison sentences beingpersonally beneficial to prosecutors, and prosecutorsmaximizing the length of prison sentences. Overall, the resultssuggest that sentence length, as opposed to convictions rates,is the relevant performance metric. 相似文献
39.
We investigated the differences in the levels of carboxyhemoglobin (COHb), cyanide (HCN) and petroleum fuels (gasoline and kerosene) between left and right ventricular bloods from fire victims. COHb was slightly, and HCN and petroleum fuels were markedly higher levels in the left than those in the right. These effects were so called 'first pass phenomena' due to the circulation, diffusion and metabolization before the deaths of fire victims. 相似文献
40.