全文获取类型
收费全文 | 1503篇 |
免费 | 63篇 |
专业分类
各国政治 | 103篇 |
工人农民 | 104篇 |
世界政治 | 108篇 |
外交国际关系 | 85篇 |
法律 | 749篇 |
中国政治 | 58篇 |
政治理论 | 358篇 |
综合类 | 1篇 |
出版年
2023年 | 14篇 |
2022年 | 11篇 |
2021年 | 16篇 |
2020年 | 39篇 |
2019年 | 44篇 |
2018年 | 67篇 |
2017年 | 57篇 |
2016年 | 62篇 |
2015年 | 43篇 |
2014年 | 44篇 |
2013年 | 233篇 |
2012年 | 61篇 |
2011年 | 51篇 |
2010年 | 46篇 |
2009年 | 48篇 |
2008年 | 59篇 |
2007年 | 55篇 |
2006年 | 41篇 |
2005年 | 50篇 |
2004年 | 37篇 |
2003年 | 37篇 |
2002年 | 34篇 |
2001年 | 35篇 |
2000年 | 34篇 |
1999年 | 28篇 |
1998年 | 9篇 |
1997年 | 20篇 |
1996年 | 16篇 |
1995年 | 21篇 |
1994年 | 18篇 |
1993年 | 17篇 |
1992年 | 20篇 |
1991年 | 26篇 |
1990年 | 16篇 |
1989年 | 11篇 |
1988年 | 8篇 |
1987年 | 10篇 |
1986年 | 13篇 |
1985年 | 14篇 |
1984年 | 11篇 |
1983年 | 12篇 |
1982年 | 7篇 |
1981年 | 12篇 |
1980年 | 5篇 |
1979年 | 6篇 |
1978年 | 9篇 |
1977年 | 4篇 |
1976年 | 4篇 |
1974年 | 4篇 |
1967年 | 5篇 |
排序方式: 共有1566条查询结果,搜索用时 7 毫秒
81.
82.
83.
84.
85.
86.
Carrick C Collins KA Lee CJ Prahlow JA Barnard JJ 《The American journal of forensic medicine and pathology》2005,26(3):275-281
Asphyxia, not an uncommon cause of sudden death, may result from numerous etiologies. Foreign-body aspiration and strangulation are 2 extrinsic causes. Airway obstruction may also be caused by laryngeal edema, asthma, infection, or anaphylaxis. Chronic causes of asphyxia include musculoskeletal diseases (eg, muscular dystrophy, amyotrophic lateral sclerosis), neurologic disorders (eg, myasthenia gravis, multiple sclerosis), respiratory disease (eg, emphysema, chronic bronchitis), or tumors. The manner of death in cases of asphyxiation may be natural, accidental, homicide, or suicide. For the death investigator, determining the cause and manner of death can often be quite challenging.We report here 2 cases of an esophageal fibrovascular polyp causing sudden asphyxial death, review of the literature, and discussion of other differential diagnoses in the case of asphyxial death. 相似文献
87.
Health policy experts have recently sounded the warning about the severe health and economic consequences of America's growing rates of obesity. Despite this fact, obesity has only begun to enter America's political consciousness and we have little information about what average Americans think of obesity or whether they support obesity-related policies. Using unique survey data collected by the authors, this essay examines public attitudes toward obesity and obesity policy. We find that, contrary to the views of health experts, most Americans are not seriously concerned with obesity, express relatively low support for obesity-targeted policies, and still view obesity as resulting from individual failure rather than environmental or genetic sources. Given the absence of elite discourse on this problem, we also find that typical determinants of policy preferences, such as ideology or partisanship, are not good predictors of attitudes on obesity policy. Rather, with a low-valence issue such as obesity, the public utilizes other attitudinal frameworks such as their opinions on smoking policy and the environmental culpability for obesity. The implications of these findings for obesity policy and research on health-related public opinion are discussed. 相似文献
88.
This study was designed to compare the qualitative results and concentrations of methamphetamine (MA) and its metabolite amphetamine (AP) in head hair and hair collected from different parts of the body (axillae and pubis). Hair from subjects (N = 14) suspected MA users was simultaneously collected. Hair preparation involved washing step, fine cutting, overnight extraction, derivatization by the trifluoroacetic anhydride, and gas chromatography/mass spectrometry (GC/MS) using selective ion monitoring. In this study, we found a good correlation of the qualitative results for MA between head hair and hair on other parts of the body, but there were some differences in concentrations of MA and AP. Namely, the concentrations of MA and AP were higher in axillary and pubic hair than in head hair. 相似文献
89.
Sequence polymorphism of the mitochondrial DNA (mtDNA) control region, hypervariable regions HVR I, HVR II and HVR III, from 51 unrelated China Han (Yan Bian area) were determined by PCR amplification and cycle sequencing. 相似文献
90.
Shin J Lee YB 《International journal of offender therapy and comparative criminology》2005,49(4):376-391
This study reviewed the public notification policy of sexual offenders against minors in South Korea as compared to community notification programs in the United States. The study then examined the policy's impact on increasing the general public's awareness of such sexual crimes. This is based on the assumption that heightening public awareness can be a starting point in combating such crimes. Results of the data, drawn from a sample of 1,409 Koreans across the nation, showed that the notification policy enhanced public awareness. Factors related to this increase in awareness were people's concern about or familiarity with the policy and people's experience in identifying the existence of known sexual offenders in their communities. Based on the results of this study, strategies for enhancing public awareness of sexual crimes on minors were formulated. The need to develop treatment programs for sexual offenders was likewise highlighted. 相似文献