全文获取类型
收费全文 | 15677篇 |
免费 | 645篇 |
专业分类
各国政治 | 631篇 |
工人农民 | 555篇 |
世界政治 | 1333篇 |
外交国际关系 | 506篇 |
法律 | 10127篇 |
中国共产党 | 1篇 |
中国政治 | 102篇 |
政治理论 | 3010篇 |
综合类 | 57篇 |
出版年
2021年 | 100篇 |
2020年 | 259篇 |
2019年 | 328篇 |
2018年 | 360篇 |
2017年 | 402篇 |
2016年 | 414篇 |
2015年 | 308篇 |
2014年 | 377篇 |
2013年 | 1526篇 |
2012年 | 357篇 |
2011年 | 439篇 |
2010年 | 393篇 |
2009年 | 427篇 |
2008年 | 447篇 |
2007年 | 413篇 |
2006年 | 403篇 |
2005年 | 384篇 |
2004年 | 394篇 |
2003年 | 354篇 |
2002年 | 356篇 |
2001年 | 721篇 |
2000年 | 636篇 |
1999年 | 456篇 |
1998年 | 258篇 |
1997年 | 221篇 |
1996年 | 168篇 |
1995年 | 167篇 |
1994年 | 189篇 |
1993年 | 167篇 |
1992年 | 298篇 |
1991年 | 329篇 |
1990年 | 314篇 |
1989年 | 315篇 |
1988年 | 298篇 |
1987年 | 296篇 |
1986年 | 308篇 |
1985年 | 291篇 |
1984年 | 239篇 |
1983年 | 242篇 |
1982年 | 164篇 |
1981年 | 183篇 |
1980年 | 120篇 |
1979年 | 192篇 |
1978年 | 115篇 |
1977年 | 96篇 |
1976年 | 94篇 |
1974年 | 118篇 |
1973年 | 114篇 |
1972年 | 97篇 |
1971年 | 77篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
Armstrong EJ Jenkins AJ Sebrosky GF Balraj EK 《The American journal of forensic medicine and pathology》2004,25(4):338-341
An unusual fatality secondary to oxycodone in a child is reported. A 2-year-old female child was conveyed to a local hospital after exhibiting signs of rubbing of the mouth and staggering. A hospital toxicological immunoassay screen for drugs of abuse and tricyclic antidepressants was performed on a urine sample and reported as negative. She was discharged and found unresponsive the next morning. She was conveyed to a second hospital in full cardiopulmonary arrest and despite resuscitative efforts, was pronounced dead upon arrival. An autopsy was performed and postmortem specimens were submitted and screened for drugs using mainly chromatographic techniques. Quantitation was achieved by gas chromatography with nitrogen phosphorus detection. Confirmation was performed by gas chromatography/mass spectrometry. Oxycodone was the only drug detected in the following concentrations: heart blood, 1.36 mg/L; gastric contents, 7.33 mg in 33 mL (222.34 mg/L); liver, 0.2 mg/kg; and urine, 47.23 mg/L (47,230 ng/mL). In addition, immunoassay testing of the urine was positive for the opiate class of drugs. This case report demonstrates an unusual cause of death in a young child with emphasis on potential limitation in hospital urine screening tests and the importance of complete forensic toxicological testing in all child deaths. 相似文献
993.
Sharma AN Nelson LS Hoffman RS 《The American journal of forensic medicine and pathology》2004,25(2):156-158
The neurologic manifestations of thallium poisoning include a severely painful ascending peripheral neuropathy, autonomic dysfunction, cranial nerve abnormalities, and a toxic encephalopathy. Although thallium has a short half-life, these neurologic manifestations commonly progress, even as the blood concentration of thallium decreases. This suggests either that thallium persists in neuronal tissues or that it initiates an injury cascade that takes time to fully manifest. As the latter mechanism is consistent with many toxin exposures, the concept of a central nervous system reservoir for thallium is often discounted. A recent case provided a unique opportunity to evaluate this possibility. A 48-year-old man was acutely and chronically thallium poisoned by his common-law wife. During his initial exposures, only gastrointestinal symptoms manifested. Following an acute ingestion, hospitalization was required. Over 3 days, his symptoms rapidly progressed from a severely painful neuropathy to slurred speech, ptosis, confusion, coma, respiratory insufficiency, and death. Because of considerations of alternative diagnoses, 2 lumbar punctures were performed, one on admission and another on the day of his death. Serum thallium concentrations obtained from stored blood samples were paired with spinal fluid concentrations from the same days. On day 1, serum and spinal fluid concentrations were 8700 mu/L and 1200 mu/L, respectively. On day 3, although the serum concentration had fallen to 7200 mu/L, the spinal fluid concentration had increased to 2100 mu/L. This case provides evidence to support the hypothesis that thallium distributes into the central nervous system more slowly than the blood compartment, and this may in part account for the progression of neurologic findings in the setting of decreasing serum concentrations. 相似文献
994.
995.
Sparer MS 《Journal of health politics, policy and law》2004,29(2):269-291
Wisconsin officials during the 1990s seemed poised to enact innovative and comprehensive health care reform. During that era, an ambitious, popular, and reform-minded governor led the state. The state had an unusually professional legislature. The state's economy was strong. Even with these advantages, however, the report card on the state's efforts is mixed. The state enacted a fairly modest set of reforms that were financed largely by the federal government and subject to extensive federal oversight. The Wisconsin story thus seems to be about the politics of incrementalism. But while critics of incrementalist politics point out that the number of uninsured continues to grow, the catalytic federalism witnessed in Wisconsin in the 1990s may well be the best model for implementing health care reform. 相似文献
996.
997.
Preuss J Padosch SA Dettmeyer R Driever F Lignitz E Madea B 《Forensic science international》2004,141(2-3):121-126
Downstairs falls frequently occur within domestic environments and are mainly associated with elderly and intoxicated individuals, often feature multiple injuries on various parts of the body. In most cases it is not possible to determine the cause of the fall and/or death solely by means of external examination. In this retrospective study, which covers a period of 11 years, all cases of death which included a fall downstairs in their case history, were collected from the Forensic Institutes of the Universities of Bonn and Greifswald, Germany. Falls downstairs made up to 2% (166 cases) of all postmortem examinations carried out within this period. Interestingly, almost double of the amount of such falls applied to males as to females. The primary cause of death was cranio-cerebral trauma and the vast majority of skull injuries associated with falls downstairs were found above 'the hat brim line'. Injuries were also often found on several other parts of the body at once. Nineteen of the 116 examined individuals exhibited agonal injuries. In these cases, postmortem examination revealed pre-existing disease or intoxication to be the cause of death and thus, cause of the fall. The injury pattern only allows a tendency towards vital or agonal incident as a conclusion. 相似文献
998.
Value of fetal autopsy after medical termination of pregnancy 总被引:2,自引:0,他引:2
Piercecchi-Marti MD Liprandi A Sigaudy S Fredouille C Adalian P Figarella-Branger D Pellissier JF 《Forensic science international》2004,144(1):7-10
We carried out a retrospective study of 352 medical terminations of pregnancy (MTP) carried out in a large French administrative region over two consecutive years. We analysed the indications for MTP and then compared the prenatal ultrasound diagnosis with fetal autopsy findings in order to demonstrate the value of pathological examination of the fetus in prenatal diagnosis and genetic counselling as well as the need to check by autopsy the quality of ultrasound screening. Preliminary analysis of the indication for these MTP showed that in 69.9% ultrasound screening had been carried out, revealing mainly brain abnormalities (22.2%) and heart defects generally associated with chromosomal abnormalities (32.1%). Prenatal findings were in agreement with autopsy results, showing no false-positive prenatal diagnoses. However, in 7.9% of cases in which brain abnormalities were detected, confirmation was not possible at autopsy because of tissue autolysis, showing the need for optimal conditions of expulsion. In 35.8% of cases, confirmation of the diagnosis by autopsy was not useful for management but still added to medical knowledge and demonstrated to the mother the reality of the defects. In 50.9%, the autopsy findings were decisive for genetic counselling. 相似文献
999.
1000.
Singh A Gaur A Shailaja K Satyare Bala B Singh L 《Forensic science international》2004,141(2-3):143-147
India is the home to five of the eight majestic big cats of the world. The three major big cats namely, lion, tiger, and leopard are listed in the Schedule I of the Indian Wildlife Protection Act, 1972. Apart from the severe loss of the habitat, these are continuously facing the danger of extinction mainly due to poaching and hunting for their body parts, which are being greatly valued by apothecaries marketing traditional Chinese medicines. With the advent of polymerase chain reaction (PCR), DNA-based markers have emerged as major tools in the arena of wildlife forensics. Microsatellites (short tandem repeats, STRs) are markers of choice because of their polymorphic and co-dominant nature. These strictly follow the Mendelian inheritance and are highly reproducible. We have identified a new microsatellite (STR) locus Ple 46, which shows amplification in a species-specific manner (size of STR) in all the members of the family felidae studied here. This PCR-based, non-invasive method opens a new avenue to forensic identification of big cats. 相似文献