全文获取类型
收费全文 | 6497篇 |
免费 | 234篇 |
专业分类
各国政治 | 349篇 |
工人农民 | 390篇 |
世界政治 | 468篇 |
外交国际关系 | 199篇 |
法律 | 3863篇 |
中国共产党 | 1篇 |
中国政治 | 95篇 |
政治理论 | 1326篇 |
综合类 | 40篇 |
出版年
2020年 | 106篇 |
2019年 | 121篇 |
2018年 | 167篇 |
2017年 | 177篇 |
2016年 | 178篇 |
2015年 | 143篇 |
2014年 | 137篇 |
2013年 | 743篇 |
2012年 | 180篇 |
2011年 | 170篇 |
2010年 | 145篇 |
2009年 | 165篇 |
2008年 | 186篇 |
2007年 | 190篇 |
2006年 | 175篇 |
2005年 | 174篇 |
2004年 | 177篇 |
2003年 | 164篇 |
2002年 | 157篇 |
2001年 | 202篇 |
2000年 | 206篇 |
1999年 | 153篇 |
1998年 | 88篇 |
1997年 | 72篇 |
1996年 | 69篇 |
1995年 | 78篇 |
1994年 | 79篇 |
1993年 | 64篇 |
1992年 | 111篇 |
1991年 | 115篇 |
1990年 | 131篇 |
1989年 | 105篇 |
1988年 | 96篇 |
1987年 | 95篇 |
1986年 | 129篇 |
1985年 | 133篇 |
1984年 | 95篇 |
1983年 | 98篇 |
1982年 | 75篇 |
1981年 | 59篇 |
1980年 | 54篇 |
1979年 | 54篇 |
1978年 | 64篇 |
1977年 | 44篇 |
1976年 | 44篇 |
1975年 | 54篇 |
1974年 | 68篇 |
1973年 | 57篇 |
1972年 | 46篇 |
1969年 | 42篇 |
排序方式: 共有6731条查询结果,搜索用时 15 毫秒
51.
52.
53.
54.
The "mini-packer" syndrome. Fatal ingestion of drug containers in Baltimore, Maryland 总被引:1,自引:0,他引:1
We report seven fatalities resulting from the ingestion of illicit drugs packaged in condoms, rubber balloons, or plastic bags which were observed in the last 4 years at the Office of the Chief Medical Examiner, State of Maryland. All the victims, with the exception of one, were men ranging in age from 19 to 37 years. There was no racial predominance. No drug paraphernalia was found at any scene. In two cases, seizure-like activity was documented. One victim had recently returned from Nigeria; therefore, Lassa fever was initially suspected. Two of the victims were "body packer" contrabanders who had just arrived from Africa. They used body cavities to hide large amounts of heroin to avoid U.S. Customs. The other five cases were "mini-packers," small-time illicit drug dealers who had swallowed a single bag of cocaine to avoid police detection. The possible mechanism of leaking or rupture of the latex container is discussed. 相似文献
55.
Programme based on mathematical model of the process of dead body temperature changing was developed for estimation of postmortem interval. Automatic retrieval of problem solution was performed on programmable microcalculators of "Electronica MK-61" type using adaptive approach. Diagnostical accuracy in case of dead body being preserved in permanent cooling conditions is +/- 3%. 相似文献
56.
F I Michelman N Redlich S R Neuwirth D Carty-Bennia 《American journal of law & medicine》1989,15(2-3):197-203
This brief opposes the overturn of "Roe v. Wade" and resists weakening "Roe's central holding" that would allow states to overturn legal abortion. The brief was written for 885 law professors. "Roe" was not a "constitutional aberration," or "an exercise of raw, judicial power." Some members of the Supreme Court seem to think that the state has "an overriding interest" in protecting fetal life. Some Court members have questioned "Roe's" trimester framework. A person's decision to abort should be done privately. If women are not free to choose abortion, they will not have equality. There is an absence of "express rights of privacy and procreational freedom" in the Constitution. "Roe" was 1 instance of the Court's recognition of constitutional rights that are not named explicitly. Historical materials are drawn on to show the link between trends in society and the "judicial recognition of unenumerated rights." The most serious questions about "Roe" deal with its trimester framework. Justice Blackmun's majority opinion said that the 1st trimester of pregnancy was personal. "Roe" said that abortions created a medical risk at the beginning of the 2nd trimester. Therefore, the government was more interested in the health of the mother at that time. The state could then regulate abortion "in ways that are reasonable related to maternal health." The start of the 3rd trimester was when the fetus was viable. The right of a woman to end her pregnancy "offends powerful moral forces." Some of "Roe's" critics had their scientific facts wrong. Medical authorities think Justice O'Connor is mistaken when she says that "Roe" is "on a collision course with itself." The 23rd to 24th week of pregnancies where the fetal organs can "sustain life outside the womb." This has not changed since "Roe" was decided in 1973, nor is it likely to in the future. Some "amici" believe that the state can never have an interest in the fetus. The state can not have an interest in the fetus distinct from the woman who will give birth to it. During previability, restricting a woman's procreational rights would not be scientifically supportable. The state does have an interest in "upholding the value of human life." "Roe" is "within the mainstream" of constitutional jurisprudence and should be reaffirmed. 相似文献
57.
A precise method for evaluating election schemes 总被引:1,自引:0,他引:1
Robert F. Bordley 《Public Choice》1985,46(2):113-123
A previously published paper evaluated election schemes under a wide variety of election circumstances. This paper improves upon the previous work by refining the measures used to rate the election schemes and increasing the statistical significance of those ratings. With these modifications, we can now draw some new conclusions:
- In general circumstances, the Borda System outperforms the Copeland System which outperforms Approval which outperforms Majority Rule.
- The Maximin Rule — strongly supported by Rawls's — turns out to be a reasonable election rule if the number of election alternatives is large relative to the number of voters.
- With two exceptions, all our election systems performed quite well given a society with highly correlated utilities.
- Given a polarized society, a serial dictatorship was better than every other election system except Borda.
58.
59.
F P Smith 《Journal of forensic sciences》1987,32(4):1098-1102
During the course of routine hospital surgical procedures, three patients lapsed into hypoxic cyanosis. Two expired immediately, another after four days of coma. Investigation of the hospital's central liquid oxygen tank revealed that it had been refilled recently and was labelled both "oxygen" and "argon." Mass spectrometric analysis of gas sampled from the questioned tank revealed a predominance of argon. A discussion of the sampling technique, method of analysis, role of the criminalist, and causes of this accident is presented. 相似文献
60.
One of the important resources to any state, such as California, is the technology that is available from the many federally operated and/or funded laboratories within its borders. In this age of technology a state needs to take advantage of applications of modern technology and innovative exploitation of human and natural resources. This article illuminates the importance of the Federal Government research laboratories. Many examples are presented to support the argument that the Federal Government research laboratories can be and often are substantial contributors to the storehouse of technology that finds its way to the private sector and public sector. Several types of technology transfer are discussed, i.e. primary technology, secondary applications, mission related, technical assistance and cooperative. In addition the article discusses the structure and logic of the Federal Laboratory Consortium for Technology Transfer (FLC). The legislaltion that has helped to make the FLC effective is discussed. Included in the discussion are insights of how the FLC operates and how the private sector and public sector may use the FLC in order to locate process, product and service technology. 相似文献