全文获取类型
收费全文 | 7277篇 |
免费 | 228篇 |
国内免费 | 5篇 |
专业分类
各国政治 | 288篇 |
工人农民 | 211篇 |
世界政治 | 396篇 |
外交国际关系 | 307篇 |
法律 | 3712篇 |
中国共产党 | 209篇 |
中国政治 | 600篇 |
政治理论 | 1105篇 |
综合类 | 682篇 |
出版年
2022年 | 43篇 |
2021年 | 64篇 |
2020年 | 117篇 |
2019年 | 83篇 |
2018年 | 101篇 |
2017年 | 128篇 |
2016年 | 124篇 |
2015年 | 135篇 |
2014年 | 142篇 |
2013年 | 599篇 |
2012年 | 244篇 |
2011年 | 317篇 |
2010年 | 328篇 |
2009年 | 354篇 |
2008年 | 338篇 |
2007年 | 396篇 |
2006年 | 409篇 |
2005年 | 337篇 |
2004年 | 204篇 |
2003年 | 194篇 |
2002年 | 193篇 |
2001年 | 269篇 |
2000年 | 196篇 |
1999年 | 146篇 |
1998年 | 72篇 |
1997年 | 58篇 |
1996年 | 47篇 |
1995年 | 63篇 |
1994年 | 56篇 |
1993年 | 51篇 |
1992年 | 98篇 |
1991年 | 97篇 |
1990年 | 110篇 |
1989年 | 93篇 |
1988年 | 85篇 |
1987年 | 85篇 |
1986年 | 106篇 |
1985年 | 110篇 |
1984年 | 77篇 |
1983年 | 79篇 |
1982年 | 50篇 |
1981年 | 47篇 |
1980年 | 44篇 |
1979年 | 48篇 |
1978年 | 55篇 |
1975年 | 46篇 |
1974年 | 61篇 |
1973年 | 55篇 |
1972年 | 42篇 |
1969年 | 41篇 |
排序方式: 共有7510条查询结果,搜索用时 15 毫秒
971.
972.
T Kojima M Yashiki T Miyazaki F Chikasue M Ohtani 《Forensic science international》1989,41(3):245-253
A 23-year-old male attempted suicide by ingesting approximately 50 ml of 5% fenitrothion emulsion, and vomited soon afterwards. He was admitted to a hospital about 3 h after ingestion. He recovered and was discharged from hospital 3 days after admission. The serum cholinesterase activity (normal range: 175-440 I.U.) was only 29 at 3 h, 32 at 1 day, 59 at 2 days and 75 at 3 days after ingestion. Fenitrothion and its metabolites in the body fluids were extracted by an Extrelut column extraction method, detected by a gas chromatograph equipped with either a hydrogen flame ionization detector or a flame photometric detector, and confirmed by a gas chromatograph-mass spectrometer. Fenitrothion concentration in the blood was 169.5 ng/g at 3 h after ingestion. The half life of blood fenitrothion concentration was found to be about 4.5 h. Fenitrothion metabolites, 3-methyl-4-nitrophenol, aminofenitrothion, aminofenitroxon, acetylaminofenitroxon and S-methylfenitrothion, were detected in the urine samples. All of them except S-methylfenitrothion were detected in the urine samples collected up to 62 h after ingestion. It would appear therefore that fenitrothion poisoning can be determined by detection and analysis of the metabolites in urine even if fenitrothion has not been detected in the blood. 相似文献
973.
C Lo Dico Y H Caplan B Levine D F Smyth J E Smialek 《Journal of forensic sciences》1989,34(4):1013-1015
A case is reported where phenol, a disinfectant, was ingested and resulted in the death of a 40-year-old white female. Concentrations of phenol were determined in blood (130 mg/L), urine (47 mg/L), bile (187 mg/L), brain (486 mg/kg), kidney (331 mg/kg), muscle (204 mg/kg), liver (228 mg/kg), and stomach content (668 mg) and compared to other cases reported in the literature. 相似文献
974.
F G Williams D Phoenix B L Kirkman-Liff 《Journal of health politics, policy and law》1989,14(3):549-563
Arizona is adding long-term care to its prepaid, capitated alternative to Medicaid. This article discusses the potential for this major cost-control experiment. Experience suggests that those able to quality for long-term care will fare better than the poor did in the previous system. However, limiting eligibility will be the primary means of controlling costs; significant price competition is not likely to develop. The bidding process will serve more to transfer risk to contract providers than to improve program efficiency. Potential cost savings will be more than offset by an increased identification of need. 相似文献
975.
Economists often claim that the tort system leads firms to provide consumers and workers with the socially optimal level of safety. Moreover, in the case of work-related hazards, employers are alleged to have another source of incentives to take precautions. If wages are sensitive to job-related risks, employers should spend money to reduce such risks when, by doing so, they can save more in wage costs than the costs of the precautions taken. Whatever their merits in other settings, in the case of latent injuries such as workplace exposure to asbestos neither tort nor market are likely to provide an optimal level of safety; indeed, they have failed to do so in the examples we discuss. We find that the introduction of a long delay between the exposure to a hazard and the onset of symptoms introduces a variety of empirical complications that overwhelm the assumptions on which the neoclassical model rests. Our conclusion is thus that comparisons between tort and alternative systems of deterrence/compensation should start from an empirical assessment of how the tort system actually works (and doesn't work), rather than beginning with misleading theoretical claims about the system's optimality. 相似文献
976.
This paper models the increase in the participation rate of criminal behavior as either the initiation rate or the career length of criminals changes in response to increases in unemployment. Even with large instantaneous increases in unemployment, the models show a very slow increase in the criminal participation rate, giving a possible explanation of the failure of many studies to demonstrate a link between unemployment and crime levels. 相似文献
977.
978.
F S Berlin 《The Bulletin of the American Academy of Psychiatry and the Law》1989,17(3):233-239
Paraphilic disorders are Axis I psychiatric afflictions. They are not acquired by volitional decision, but are manifested by the association of erotic arousal with unacceptable behavior or stimulae (e.g., children). Because paraphilic behavior occurs in the service of a biological drive, use of medication to suppress sexual appetite may constitute an adjunct in treatment. Medroxyprogesterone can be used to decrease unacceptable erotic urges and fantasies, with the intent of increasing self-control. Such treatment should not be forced upon an unwilling person. Conversely, persons should not be denied access to treatment by laws which deter seeking help, or because of incarceration, parole, or probation. 相似文献
979.
Determination of sex with a discriminant analysis of new pelvic bone measurements: Part II 总被引:1,自引:0,他引:1
The pelves of 100 white skeletons were measured on both sides for the following: (1) length from the superiormost aspect of the pubic symphysis to the nearest rim of the acetabulum (PS-A), (2) length from the highest point of the pubic tubercle to the nearest rim of the acetabulum (PT-A), (3) acetabular diameter (AD), (4) the vertical distance from the anterior aspect of the ischial tuberosity to the farthest rim of the acetabulum (IT-A), and (5) greatest femur head diameter. From these, three indices were derived: AD/PS-A (acetabulum/pubis index), AD/PT-A (acetabular diameter/pubic tubercle-acetabular rim index), and IT-A/PS-A (ischium-acetabulum height/pubic symphysis-acetabular rim index). The left AD/PS-A ratio and left IT-A height proved statistically to be of greatest discriminating value. Using these two variables, a discriminant function was derived which correctly separated 98% of our sample. The acetabulum/pubis ratio alone correctly assigned 95%. With either the discriminant function analysis of two variables or the acetabulum/pubis index as a single predictor, 97% of our sample of known sex was correctly identified if all specimens that fell within a doubtful or overlapping range of values were sorted by femur head diameter. 相似文献
980.
Much of the research on fear of crime indicates that women and older persons are highly afraid of crime. These findings, especially older persons' fear of crime, are widely communicated in the scientific and popular media. This study examines age and gender differences in perceived risk and fear of crime. The data are from telephone interviews of 320 randomly selected residents in a southeastern metropolitan area of the United States. The relationships of age and gender to fear of crime are compared using a National Crime Survey (NCS) measure of fear of crime and 11 alternative indicators of fear of specific offenses. Women reported signifcantly greater perceived risk and fear of crime than men regardless of how fear of crime was measured and older adults reported the greatest fear of crime when the NCS measure was used. but not when the alternative individual measures of fear of crime were used. A LISREL model with latent constructs for fear of personal crime and fear of property crime also indicates that older adults do not have higher levels of fear of crime. In short, the extent of fear in the everyday lives of most older persons has been overestimated in many previous studies because of measurement problems. 相似文献