全文获取类型
收费全文 | 10594篇 |
免费 | 291篇 |
专业分类
各国政治 | 400篇 |
工人农民 | 378篇 |
世界政治 | 718篇 |
外交国际关系 | 286篇 |
法律 | 6718篇 |
中国政治 | 67篇 |
政治理论 | 2230篇 |
综合类 | 88篇 |
出版年
2020年 | 102篇 |
2019年 | 155篇 |
2018年 | 190篇 |
2017年 | 218篇 |
2016年 | 212篇 |
2015年 | 161篇 |
2014年 | 184篇 |
2013年 | 941篇 |
2012年 | 215篇 |
2011年 | 265篇 |
2010年 | 210篇 |
2009年 | 269篇 |
2008年 | 270篇 |
2007年 | 269篇 |
2006年 | 264篇 |
2005年 | 243篇 |
2004年 | 234篇 |
2003年 | 242篇 |
2002年 | 236篇 |
2001年 | 423篇 |
2000年 | 366篇 |
1999年 | 294篇 |
1998年 | 158篇 |
1997年 | 122篇 |
1996年 | 138篇 |
1995年 | 133篇 |
1994年 | 133篇 |
1993年 | 135篇 |
1992年 | 232篇 |
1991年 | 251篇 |
1990年 | 240篇 |
1989年 | 250篇 |
1988年 | 225篇 |
1987年 | 224篇 |
1986年 | 264篇 |
1985年 | 256篇 |
1984年 | 231篇 |
1983年 | 214篇 |
1982年 | 151篇 |
1981年 | 127篇 |
1980年 | 113篇 |
1979年 | 151篇 |
1978年 | 86篇 |
1977年 | 111篇 |
1976年 | 96篇 |
1975年 | 72篇 |
1974年 | 91篇 |
1973年 | 84篇 |
1972年 | 78篇 |
1971年 | 69篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
991.
In 16 medical examiner's cases, which were found to be barbiturate-positive by thin-layer chromatographic screening of the liver, blood barbiturate concentrations were determined by gas chromatography. The corresponding vitreous humor samples were screened by the enzyme multiplied immunoassay technique, the EMIT-st serum barbiturate assay. By using the recommended dilution for detecting serum barbiturates, it was possible to detect barbiturates in vitreous humor at a toxic concentration. By using one fourth the amount of diluent, the barbiturates could be detected also at a therapeutic concentration. The EMIT-st assay proved to be useful in the screening for barbiturates in vitreous humor, a material that is readily available in forensic toxicology. 相似文献
992.
Conventional wisdom suggests that individual members of Congress have no real incentive to act in ways that might improve public evaluations of their collective body. In particular, the literature provides no clear evidence that public evaluations of Congress affect individual races for Congress, and little reason to expect that voters would hold specific individuals responsible for the institution's performance. We suggest that this conventional wisdom is incorrect. Using multiple state‐level exit polls of Senate voting conducted by Voter News Service in 1996 and 1998, we arrive at two key findings. First, we find that evaluations of Congress do have a significant effect on voting within individual U.S. Senate races across a wide variety of electoral contexts. Second, we find that punishments or rewards for congressional performance are not distributed equally across all members, or even across members of a particular party. Instead, we find that the degree to which citizens hold a senator accountable for congressional performance is significantly influenced by that senator's actual level of support for the majority party in Congress, as demonstrated on party votes. 相似文献
993.
The first 150 words of the full text of this article appear below. Key points
1. Introduction
Scholarship describes professionals who participate in securitiesofferings, and who represent public companies in . . . [Full Text of this Article]
2. Background
3. Modelling law firm impact in IPOs
Theories of IPO pricing Relationship between pre-IPO price adjustment and diligence in legal services Extension of Hanley's model Conservative modelonly a portion of the impact is identified Issuer's counsel v underwriters counsel Confirming proper model specification Increased risk of an investment in the issuer affecting probability of engagement of quality law firm Different signs between issuer's lawyer and underwriters lawyer
4. Data
Summary statistics Measure of law firm prestige
- The article investigates the relationship betweenpricing in an initial public offering (IPO) and the prestigeof the participating underwriters law firm.
- The hypothesisof the article is that law firm quality affects how law firmsperform their obligations in IPOsmore prestigious lawfirms acting more independently. Consistent with this hypothesis,the authors find a negative relationship between pre-IPO priceadjustment and the participation of prestigious underwriterscounsel, and a negative relationship between the participationof prestigious underwriters counsel and initial return,which is consistent with market trading reflecting the decreasedrisk associated with offerings involving prestigious underwriterscounsel.
- Finally, it is found that certain observable characteristicsindicating diminished likelihood of undisclosed negative information(venture backing and quality of the issuer's counsel) are associatedwith an increased likelihood that prestigious underwriterscounsel is used.