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   1608篇
  免费   358篇
  国内免费   5篇
儿科学   41篇
妇产科学   164篇
基础医学   24篇
口腔科学   44篇
临床医学   1058篇
内科学   156篇
皮肤病学   14篇
神经病学   39篇
特种医学   48篇
外科学   60篇
综合类   27篇
预防医学   120篇
眼科学   102篇
药学   23篇
中国医学   4篇
肿瘤学   47篇
  2024年   12篇
  2023年   56篇
  2021年   26篇
  2020年   29篇
  2019年   14篇
  2018年   90篇
  2017年   107篇
  2016年   108篇
  2015年   97篇
  2014年   96篇
  2013年   102篇
  2012年   48篇
  2011年   53篇
  2010年   61篇
  2009年   90篇
  2008年   63篇
  2007年   71篇
  2006年   47篇
  2005年   52篇
  2004年   41篇
  2003年   24篇
  2002年   24篇
  2001年   36篇
  2000年   21篇
  1999年   39篇
  1998年   42篇
  1997年   65篇
  1996年   54篇
  1995年   51篇
  1994年   39篇
  1993年   31篇
  1992年   28篇
  1991年   20篇
  1990年   30篇
  1989年   21篇
  1988年   15篇
  1987年   15篇
  1986年   10篇
  1985年   9篇
  1984年   10篇
  1983年   9篇
  1982年   9篇
  1981年   11篇
  1980年   7篇
  1979年   9篇
  1978年   6篇
  1977年   7篇
  1976年   13篇
  1975年   11篇
  1973年   7篇
排序方式: 共有1971条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
MR compatibility of Guglielmi detachable coils   总被引:6,自引:0,他引:6  
  相似文献   
5.
Seventy-four 8th- and 10th-grade students attending a private girls' school in Hawaii were queried about their perceptions of and preparation for menstruation using a questionnaire administered in a health education class. Eighty percent had already started menstruating. The most frequently cited perceptions by the respondents referred to both the inconveniences and the normalcy of menstruation. Many were first informed about menstruation by their mothers and stated that they also first informed their mothers when they started menstruating. Surprise, fear, and embarrassment were common initial reactions, while strong negative or positive emotions were more rare. Only 35% wanted boys and girls together during class discussion, but 89% stated that boys needed to be informed about menstruation. The most frequent reasons cited for noncoed settings were the girls' concern about their comfort in openly discussing menstruation. Thirty-eight percent thought parents should inform other siblings when they started menstruation, although almost half gave specific conditions the parents should consider. The majority thought the fifth to sixth grades were the best times to introduce menstruation content.  相似文献   
6.
AIM: The aim of this retrospective clinical study was to evaluate dental arch, skeletal, dentoalveolar, and soft tissue profile changes following treatment of Class III malocclusion by means of the Function Regulator (FR-3) appliance. SUBJECTS AND METHODS: The study sample consisted of 14 growing patients (seven boys and seven girls) with a mean age of 9.7 +/- 1.1 years presenting Class III malocclusion. They were treated with an FR-3 appliance exclusively for a period of 2.4 +/- 0.6 years. Dental casts and lateral cephalometric radiographs were obtained immediately before initiation and after completion of treatment with the FR-3 appliance. Thirteen variables were used for the dental cast analysis and 61 variables for the cephalometric analysis. The paired t-test was utilized to evaluate the presence of significant changes (p < 0.05). RESULTS: The evaluation of the dental casts revealed that there was a significant increase in intermolar, interpremolar, and intercanine width of the maxilla and of palatal height after treatment. Concerning the mandible, an increase in intermolar and intercanine width and a decrease in lower arch depth were observed. Cephalometric evaluation revealed a significant decrease in SNB angle and an increase in ANB angle, overjet, facial convexity, nose prominence, and lower soft tissue face height. There was an increase in upper lip thickness and a decrease in lower lip convexity observed after treatment. CONCLUSIONS: The results of this study confirm a favorable functional and esthetic maxillary and mandibular position following treatment by means of the function regulator (FR-3) appliance.  相似文献   
7.
8.
9.
10.
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