全文获取类型
收费全文 | 7633篇 |
免费 | 470篇 |
专业分类
各国政治 | 356篇 |
工人农民 | 243篇 |
世界政治 | 510篇 |
外交国际关系 | 270篇 |
法律 | 5239篇 |
中国政治 | 39篇 |
政治理论 | 1404篇 |
综合类 | 42篇 |
出版年
2020年 | 164篇 |
2019年 | 173篇 |
2018年 | 184篇 |
2017年 | 223篇 |
2016年 | 216篇 |
2015年 | 208篇 |
2014年 | 188篇 |
2013年 | 843篇 |
2012年 | 167篇 |
2011年 | 184篇 |
2010年 | 211篇 |
2009年 | 235篇 |
2008年 | 189篇 |
2007年 | 176篇 |
2006年 | 180篇 |
2005年 | 179篇 |
2004年 | 199篇 |
2003年 | 173篇 |
2002年 | 147篇 |
2001年 | 322篇 |
2000年 | 261篇 |
1999年 | 235篇 |
1998年 | 110篇 |
1997年 | 72篇 |
1996年 | 78篇 |
1995年 | 89篇 |
1994年 | 96篇 |
1993年 | 94篇 |
1992年 | 159篇 |
1991年 | 163篇 |
1990年 | 151篇 |
1989年 | 159篇 |
1988年 | 128篇 |
1987年 | 140篇 |
1986年 | 126篇 |
1985年 | 140篇 |
1984年 | 108篇 |
1983年 | 124篇 |
1982年 | 85篇 |
1981年 | 88篇 |
1980年 | 56篇 |
1979年 | 109篇 |
1978年 | 72篇 |
1977年 | 58篇 |
1976年 | 51篇 |
1975年 | 47篇 |
1974年 | 55篇 |
1973年 | 56篇 |
1972年 | 47篇 |
1968年 | 40篇 |
排序方式: 共有8103条查询结果,搜索用时 15 毫秒
991.
Determinations of blood cyanide and carboxyhemoglobin concentrations were performed in 18 victims found dead in buildings after fires during a 2-year period. The results indicated that 50% of the victims had been exposed to toxic levels of hydrogen cyanide and 90% to toxic levels of carbon monoxide. Lethal concentrations of carbon monoxide were found in 83% of the victims. In one case a lethal blood cyanide but a non-toxic blood carboxyhemoglobin value was found. It is concluded that carbon monoxide appears to be more important than hydrogen cyanide as a toxic agent in the fire atmosphere, but cyanide poisoning without carbon monoxide poisoning may, under certain circumstances, be the cause of death in fire victims. 相似文献
992.
In response to published but unconfirmed reports that health care costs were a leading cause of personal bankruptcy in the U.S., court records of all bankruptcy petitioners in one judicial district were examined. The records were analyzed by income, employment, debt categories and amounts. Within the limitations of the study, health care costs seem not to have played a significant role in the financial lives of this population. 相似文献
993.
Arrow wounds represent an unusual class of wounds rarely seen by most death investigators. Although the edged, broadhead-tipped arrow produces a wound usually characteristic of archery/crossbow weapons, the plain, field-tipped arrow wound can be confused with gunshot injuries in those cases in which powder residue or firearm projectiles or fragments or both are not recovered. We present a case of a deer carcass with a wound of uncertain firearm or archery origin which initiated a comparison of firearm wounds and archery wounds on fresh road-killed deer. We found the following features to be valuable in the differentiation of gunshot wounds and field-tipped archery wounds: First, the majority of the gunshot wounds (but none of the arrow wounds) had identifiable, macroscopic, wipe-off material and chemically identifiable wipe-off residue by spot test. Second, the archery wound defects had very inconspicuous abrasion rings as compared to the often prominent abrasion rings of gunshot wounds. Third, the actual central defect in the archery wounds was more likely to be oblong or slit-like compared to the gunshot wound defects, which were more likely to be round. 相似文献
994.
J A Silva G B Leong R Weinstock C L Boyer 《The Bulletin of the American Academy of Psychiatry and the Law》1989,17(1):5-14
This article discusses Capgras syndrome and its association with harmful and potentially harmful behaviors. Phenomenological and psychodynamic analysis of a series of cases will highlight danger signals that may be present in Capgras patients. 相似文献
995.
996.
A method is described for the determination of glyoxalase I phenotypes in liquid blood and dry bloodstains. The frequencies of glyoxalase I phenotypes in various populations of S.E. England are included. 相似文献
997.
998.
999.
Case involving differentiation of deer and human bone fragments 总被引:4,自引:0,他引:4
In a recent Louisiana forensic anthropology case, it was necessary to attempt species identification of six small bone fragments. The primary concern was whether or not they matched the fractured humerus of a woman killed by two shotgun blasts and then disposed of in the Mississippi River. These tiny fragments were recovered by law enforcement officers inside a jeep pickup and at the gas station where the vehicle had been cleaned. The police suspect claimed that these fragments were from a deer that he had recently killed. The small size of the pieces precluded positive recognition of human versus nonhuman origin based upon gross morphology and cortical thickness. Microscopic examination was possible. This analysis involved comparison of the unknown specimens to reference deer and human thin sections including bone recovered from the woman during autopsy. Examination of the jeep and gas station fragments revealed no plexiform bone, secondary (not primary) osteons, and variability in size and shape of the osteons and Haversian canals. These and other variables identified the bone fragments as human. 相似文献
1000.
Keith J. Mueller 《政策研究评论》1984,4(1):86-98
This article is an examination of failures in implementing intergovernmental programs. The programs were failures in the sense that actions to implement programs were delayed far beyond the expected dates of completion. Two such failures in cities implementing two different programs (wastewater management and Section 8 housing programs) are contrasted with one instance of success (in Section 8 housing). If a Sharkansky's discussion of political and policy routines is found to be a useful explanation of the different results. When local government routines must be broken to comply with the goals and objectives of federal programs, local actors will do all they can to resist the federal program. This finding demonstrates the importance of varying local political environments in explaining varying patterns of implementation of federal programs. 相似文献