全文获取类型
收费全文 | 6704篇 |
免费 | 146篇 |
专业分类
各国政治 | 317篇 |
工人农民 | 263篇 |
世界政治 | 544篇 |
外交国际关系 | 275篇 |
法律 | 3998篇 |
中国政治 | 59篇 |
政治理论 | 1370篇 |
综合类 | 24篇 |
出版年
2021年 | 43篇 |
2020年 | 77篇 |
2019年 | 132篇 |
2018年 | 154篇 |
2017年 | 144篇 |
2016年 | 156篇 |
2015年 | 86篇 |
2014年 | 143篇 |
2013年 | 774篇 |
2012年 | 168篇 |
2011年 | 178篇 |
2010年 | 152篇 |
2009年 | 167篇 |
2008年 | 202篇 |
2007年 | 175篇 |
2006年 | 169篇 |
2005年 | 159篇 |
2004年 | 187篇 |
2003年 | 153篇 |
2002年 | 124篇 |
2001年 | 333篇 |
2000年 | 300篇 |
1999年 | 212篇 |
1998年 | 96篇 |
1997年 | 98篇 |
1996年 | 66篇 |
1995年 | 67篇 |
1994年 | 61篇 |
1993年 | 55篇 |
1992年 | 135篇 |
1991年 | 149篇 |
1990年 | 140篇 |
1989年 | 139篇 |
1988年 | 124篇 |
1987年 | 136篇 |
1986年 | 109篇 |
1985年 | 102篇 |
1984年 | 106篇 |
1983年 | 91篇 |
1982年 | 64篇 |
1981年 | 80篇 |
1980年 | 36篇 |
1979年 | 77篇 |
1978年 | 49篇 |
1975年 | 42篇 |
1974年 | 51篇 |
1973年 | 55篇 |
1972年 | 44篇 |
1971年 | 36篇 |
1970年 | 32篇 |
排序方式: 共有6850条查询结果,搜索用时 0 毫秒
991.
The 1 mu focal spot x-ray tube, which had been developed for industrial purposes, allows for the first time high grade direct radiographic magnification. The first results with this new technique in forensic medicine are presented. Due to the high proportion of soft radiation, tiny glass fragments which can not be detected with conventional radiographic techniques, are visualized in the radiographic magnification. Furthermore, these foreign bodies can clearly be differentiated from other contrasted structures, like dust particles, subcutaneous fat etc. 相似文献
992.
J T Melella S Travin K Cullen 《The Bulletin of the American Academy of Psychiatry and the Law》1989,17(3):223-232
Antiandrogen treatment of sexual offenders raises serious legal and ethical considerations in both the medical profession and in the courts. Discussion is offered on the use of antiandrogens in both an involuntary and voluntary context. The potential negative impact of this treatment modality on such constitutional issues as privacy interests, right to procreative freedom, freedom of speech and communication, and freedom from cruel and unusual punishment is explored and notable, germane court cases are presented. The need for clear ethical guidelines for the administration of this treatment is stressed. 相似文献
993.
994.
995.
As organ transplantation procedures become accepted as standard medical practice, it is anticipated that the frequency of liability claims against transplant care providers will increase. This article examines current statutory and common law analyses of malpractice issues in transplantation, with particular attention given to issues of informed consent as they arise both for the organ donor and donee. 相似文献
996.
In TLC screenings of 335 urine samples taken because of suspicion of heroin consumption, positive evidence of morphine was found in about 50% of the cases, which was confirmed without exception by gas chromatography-mass spectrometry. In 66% of the positive cases, morphine and codeine were found; in about 31% only morphine was found, and the median value of 0.4 mg/l free morphine and 1.0 mg/l conjugated morphine was considerably lower than in the whole collection of samples. Comparison of the codeine/morphine quotients (Q), especially the free bases, proves that the groups of heroin/morphine or codeine consumers can be distinctly differentiated. The critical conditions of the conjugated bases worked out by Dutt et al. (1983) proved to be right. Using the equation Qf less than 0.5 square root c, a boundary condition for the free flare bases can also be developed, which is dependent on the sum of the codeine and morphine concentrations and which proves heroin/morphine consumption with 98% certainty. 相似文献
997.
Porter D 《Journal of law and medicine》2005,13(2):256-270
With advances in medical technology, it is now possible to sustain the life of a person in a persistent vegetative state (PVS) until a decision is made to withhold or withdraw life-sustaining treatment. Who makes that decision? Under the Medical Treatment Act 1988 (Vic) there is no legally enforceable right for a person to choose, in advance, what intervention that person will and will not accept if he or she ends up in a PVS. The best that can be achieved is that a person can appoint an agent who is empowered to refuse medical treatment on the person's behalf in the event of incompetence. It is suggested that this mechanism ignores two fundamental human rights: self-determination and the inherent right to dignity. This article proposes the development of an advance directive mechanism that provides for a person to refuse, in advance, specified intervention, thereby respecting fundamental human rights and alleviating the existing need for an agent to second-guess a person's desires and best interests. 相似文献
998.
Fanton L Bévalot F Schoendorff P Lalliard S Jdeed K Malicier D 《The American journal of forensic medicine and pathology》2007,28(3):262-266
A prospective study of 161 victims of falls from height is reported. The aim was to determine the interest of systematic qualitative and quantitative toxicological analysis in such fatalities. The primary cause of death was suicide (84.5%), followed by accidents (7%) and homicide (1%). In the remaining 7.5%, cause of death was undetermined. In the suicides, there was evidence of psychotropic medicines in 57% of the observations, with a much higher proportion of benzodiazepines and antidepressants in women than in men. Quantitative toxicologic analysis showed overdosing on medication in 16 suicide victims, with toxic levels in 11 of these. Systematic qualitative and quantitative toxicologic analysis made a significant contribution to the diagnosis of suicide by revealing either an unknown psychiatric treatment or a toxic level. 相似文献
999.
Eaton DK Davis KS Barrios L Brener ND Noonan RK 《Journal of interpersonal violence》2007,22(5):585-602
This study examined the association of victimization in a physically violent dating relationship with risk behaviors, age of risk behavior initiation, and co-occurrence of risk behaviors among students in grades 9 through 12 in the United States. Data were from the 2003 national Youth Risk Behavior Survey (YRBS). Nearly 9% of students reported experiencing dating violence victimization. Dating violence victimization was associated with alcohol use, marijuana use, and having ever had sexual intercourse among female students and having ever had sexual intercourse among male students. Dating violence victimization also was associated with early initiation of alcohol use among female students. The odds of dating violence victimization increased as the number of risk behaviors increased and as the number of lifetime sexual partners increased. These risk behavior patterns should serve as warning signs of elevated risk for dating violence victimization and may be helpful in identifying adolescents who could benefit from targeted, preventive interventions. 相似文献
1000.
Brown LK Puster KL Vazquez EA Hunter HL Lescano CM 《Journal of interpersonal violence》2007,22(4):456-464
This study sought to determine the screening practices of child and adolescent psychiatrists regarding adolescent dating violence (DV). A questionnaire regarding screening practices for DV and other risk behaviors was administered to 817 child and adolescent psychiatrists via the Internet and mail. Twenty-one percent of clinicians screened for DV "more than 90% of the time," and 65% had identified it in the past year. Multiple logistic regression analyses found that screening for DV was associated with consistent screening for either substance use or interparental violence (OR=3.0 and 6.3, respectively). Despite the prevalence of DV, only a minority of psychiatrists screen their adolescent patients for this type of risk. These data suggest that screening for DV is associated with consistent screening practices for other risk behaviors. Screening rates may be improved with training and adherence to specific protocols. 相似文献