首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   18508篇
  免费   1246篇
  国内免费   47篇
耳鼻咽喉   113篇
儿科学   652篇
妇产科学   365篇
基础医学   2963篇
口腔科学   331篇
临床医学   2196篇
内科学   3338篇
皮肤病学   555篇
神经病学   2223篇
特种医学   588篇
外科学   1758篇
综合类   151篇
一般理论   18篇
预防医学   1717篇
眼科学   281篇
药学   1226篇
中国医学   25篇
肿瘤学   1301篇
  2023年   149篇
  2022年   226篇
  2021年   522篇
  2020年   280篇
  2019年   418篇
  2018年   497篇
  2017年   365篇
  2016年   422篇
  2015年   467篇
  2014年   625篇
  2013年   900篇
  2012年   1303篇
  2011年   1274篇
  2010年   656篇
  2009年   642篇
  2008年   1059篇
  2007年   1106篇
  2006年   1036篇
  2005年   980篇
  2004年   952篇
  2003年   886篇
  2002年   866篇
  2001年   345篇
  2000年   283篇
  1999年   278篇
  1998年   224篇
  1997年   180篇
  1996年   139篇
  1995年   135篇
  1994年   123篇
  1993年   138篇
  1992年   143篇
  1991年   149篇
  1990年   141篇
  1989年   138篇
  1988年   123篇
  1987年   102篇
  1986年   124篇
  1985年   100篇
  1984年   114篇
  1983年   98篇
  1982年   96篇
  1981年   86篇
  1980年   69篇
  1979年   88篇
  1978年   54篇
  1977年   60篇
  1975年   49篇
  1974年   57篇
  1973年   65篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
International Journal of Clinical Pharmacy - Background Drug-related problems (DRP) following hospital discharge may cause morbidity, mortality and hospital re-admissions. It is unclear whether a...  相似文献   
3.
4.
5.
6.
7.
8.
9.
PURPOSE: The advantages of a focometer (FOCOMETER) over other methods of refraction for use in developing countries are that it is lightweight, compact, relatively inexpensive, fairly quick, and easy to use with minimal training. This clinical trial compared the repeatability, validity, and ease of use of the focometer with an autorefractor. METHODS: The refractive status of the right eye of 80 participants was determined with an autorefractor (Canon RK3). Three measurements were also taken with the focometer. RESULTS: The spherical equivalent (M) of the focometer was 0.25 D more positive than the autorefractor (p < 0.001) and 84% of measurements were within 0.75 D of the autorefractor. The autorefractor detected astigmatism in 91% (73) of the eyes, whereas the focometer identified only 32% (26). The design of the clock target restricts cylinder axis accuracy to the nearest 15 degrees . There was evidence of a learning effect for the focometer: the second and third measurements were more repeatable in the untrained group. There were no differences between the mean (1.03 +/- 2.28) and third focometer (-1.05 +/- 2.32) measurements (p = 0.34). However, using the third focometer measurement, 94% of participants had visual acuities of at least 6/12(-2). CONCLUSIONS: This study highlighted the focometer's restricted power range, inaccuracy of astigmatism and axis determination, and dependence on subject understanding and compliance. Therefore, in most clinical settings, the focometer would not be adequate for quantifying refractive error, but the focometer spherical equivalent was within acceptable limits of the autorefractor, and the visual acuity with lenses determined by the focometer indicates its potential usefulness in public health settings, especially where only spherical ready-made spectacles are dispensed. There may be more cost-effective ways to determine refractive error in these circumstances. A potentially important enhancement in focometer methodology that improves its ease of use was identified: use only the third measurement for each eye.  相似文献   
10.
Decreases in sex hormone levels with menopause may bring about a number of consequences in women's general health and sexual well-being, especially when levels decline suddenly and prematurely, as in surgical menopause. In addition to the well-established role of estrogens in preserving the biological basis of sexual response, there is emerging evidence that androgens are significant independent determinants affecting sexual desire, activity and satisfaction, as well as mood, energy and other components of women's health. Hypoactive sexual desire disorder (HSDD), a persistent absence of sexual fantasies or thoughts and/or desire for and receptivity to sexual activity that causes personal distress, is experienced by some postmenopausal women. Even though conventional hormone therapy with estrogens or estrogens and progestogens may be effective for vaginal atrophy, increasing vaginal lubrication and reducing dyspareunia, it has not been shown to consistently increase sexual desire or activity and many women with sexual dysfunction remain unresponsive. Several recent, large, phase III studies have shown that the addition of transdermal testosterone to conventional hormone therapy can be helpful in surgically menopausal women presenting with HSDD. After 24 weeks of treatment in these studies, testosterone-treated women experienced significantly greater increases in satisfying sexual activity and sexual desire, and greater decreases in distress, than placebo-treated women. Accurate clinical assessment and individualized management of sexual symptoms are fundamentally important for all menopausal women with HSDD or other sexual problems.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号