全文获取类型
收费全文 | 67147篇 |
免费 | 3283篇 |
专业分类
各国政治 | 4467篇 |
工人农民 | 2854篇 |
世界政治 | 5884篇 |
外交国际关系 | 3803篇 |
法律 | 31175篇 |
中国共产党 | 9篇 |
中国政治 | 747篇 |
政治理论 | 20551篇 |
综合类 | 940篇 |
出版年
2021年 | 399篇 |
2020年 | 1159篇 |
2019年 | 1513篇 |
2018年 | 1641篇 |
2017年 | 1944篇 |
2016年 | 2163篇 |
2015年 | 1824篇 |
2014年 | 2099篇 |
2013年 | 10525篇 |
2012年 | 1556篇 |
2011年 | 1660篇 |
2010年 | 1800篇 |
2009年 | 2050篇 |
2008年 | 1701篇 |
2007年 | 1661篇 |
2006年 | 1833篇 |
2005年 | 1729篇 |
2004年 | 1616篇 |
2003年 | 1443篇 |
2002年 | 1474篇 |
2001年 | 1489篇 |
2000年 | 1273篇 |
1999年 | 1187篇 |
1998年 | 1080篇 |
1997年 | 959篇 |
1996年 | 941篇 |
1995年 | 895篇 |
1994年 | 903篇 |
1993年 | 924篇 |
1992年 | 913篇 |
1991年 | 968篇 |
1990年 | 920篇 |
1989年 | 955篇 |
1988年 | 957篇 |
1987年 | 980篇 |
1986年 | 940篇 |
1985年 | 1016篇 |
1984年 | 911篇 |
1983年 | 940篇 |
1982年 | 876篇 |
1981年 | 828篇 |
1980年 | 649篇 |
1979年 | 693篇 |
1978年 | 597篇 |
1977年 | 525篇 |
1976年 | 477篇 |
1975年 | 415篇 |
1974年 | 429篇 |
1973年 | 434篇 |
1972年 | 362篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
971.
972.
973.
974.
975.
976.
In Hannover/Germany in 1976 a so called "Society for Regenerative Hyperbaric Therapy" (Gesellschaft für Regenerative Uberdruck-Therapie) subjected 20 patients within two coupled multi-place chambers to a simulated hyperbaric environment, equivalent to a maximum of 4 ata, followed usually by gradual reductions of the pressure. The patients were of an average age of 67.2 years and were afflicted by various disorders. During one of the "dives" a patient developed air embolism of the central nervous system. During ensuing confusion of the chamber was opened suddenly, with resultant explosive reduction of the high pressure. This resulted in five letal accidents of decompression sickness. Post mortem examination revealed diffuse distribution of gas bubbles throughout the entire body. By elecronmicroscopy each bubble was covered by an osmiophilic coat. Post mortem findings are discussed and correlated with well-known and new clinical symptomes. These observations present for the first time fatal accidents of decompression sickness in humans, associated with hyperbaric air-therapy. 相似文献
977.
The abuse of heroin (diacetylmorphine) in Singapore escalated sharply in 1975 and 1976, as indicated by the 35-fold increase in the number of heroin seizures and the 20-fold increase in the urine samples containing morphine since 1974. A rapid and simple GC method has been described to estimate diacetylmorphine (and caffeine). Monoacetylmorphine and acetylcodeine may be ascertained by an additional step involving acetylation. All gas chromatograms of a large number of samples analyzed consistently had the same pattern, indicating that they possibly had a common origin. This GC "fingerprint," together with the quantitative data, appears to be characteristic of the illicit Asian or Chinese type of heroin found in Singapore. The proportions of the four major ingredients in some twelve typical samples have been tabulated. Statistical data confirming the accuracy and reproducibility of the analytical method have also been presented. 相似文献
978.
979.
Simon SH 《The Personnel journal》1978,57(11):622-5, 640
980.
John J. Carson 《Canadian public administration. Administration publique du Canada》1978,21(4):539-547
Abstract. The efforts to functionally bilingualize the federal public service over the past decade have generally attracted more jeers than cheers. In this rather personal article the author attempts to describe and defend his own role and that of the Public Service Commission in a major attempt at adult re-education. 相似文献