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   36292篇
  免费   1463篇
  国内免费   15篇
  2020年   360篇
  2019年   435篇
  2018年   644篇
  2017年   556篇
  2016年   621篇
  2015年   404篇
  2014年   595篇
  2013年   2729篇
  2012年   1012篇
  2011年   1113篇
  2010年   626篇
  2009年   729篇
  2008年   958篇
  2007年   986篇
  2006年   941篇
  2005年   798篇
  2004年   796篇
  2003年   760篇
  2002年   712篇
  2001年   1181篇
  2000年   1238篇
  1999年   885篇
  1998年   428篇
  1997年   361篇
  1996年   348篇
  1992年   733篇
  1991年   671篇
  1990年   746篇
  1989年   654篇
  1988年   618篇
  1987年   573篇
  1986年   605篇
  1985年   672篇
  1984年   514篇
  1983年   474篇
  1982年   358篇
  1979年   549篇
  1978年   455篇
  1977年   341篇
  1976年   337篇
  1975年   499篇
  1974年   564篇
  1973年   590篇
  1972年   483篇
  1971年   437篇
  1970年   355篇
  1969年   408篇
  1968年   508篇
  1967年   472篇
  1966年   469篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
181.
The Rosenberg Self-esteem Scale was administered to 550 14- and 16-yr.-old (+/- 6 mo.) girls. Self-esteem scores were categorized by weight and weight by height. Scores on the Quetelet Index for obesity were correlated with self-esteem scores. Mean self-esteem of the low- and middle-weight by height group was significantly higher than the mean of the high-weight by height group. In analyzing weight alone, the self-esteem of the middle-weight group was significantly higher than the self-esteem of the high-weight group. The correlation of the obesity index and self-esteem indicated that as weight increased self-esteem decreased.  相似文献   
182.
Observations on three children with neurolisteriosis (one case of meningitis, two cases of meningoencephalitis, each Serovar 4 b), show that even after the neonatal period, listeriosis must not be ignored in the process of diagnosis and therapy. It is the bacteriological examination of the cerebrospinal fluid, together with the blood culture, and not clinical symptoms and serology that guarantee a timely diagnosis and therapy (ampicillin and gentamicin).  相似文献   
183.
184.
185.
"Abnormal fusion" of stereopsis and binocular rivalry   总被引:1,自引:0,他引:1  
  相似文献   
186.
187.
Practice in front of a mirror is a common procedure for activities such as dance, gymnastics, and other sports. The purpose of this study was to examine the effect that performing with concurrent visual feedback from a mirror had on the acquisition of the power clean movement. 18 college-age males who had no prior experience with the power clean movement served as subjects who were assigned to one of two groups. One group had use of a mirror during the practice trials and the other practiced without the mirror. All subjects viewed an instructional videotape and had practice trials. All subjects were evaluated for proper technique on a pretest, a posttest without the mirror, and a posttest with the mirror. Analysis showed a significant difference between pre- and posttest performances for both groups and a significant difference between groups on the posttest performances with the mirror. Evidently the videotaped instruction was sufficient to allow both groups to improve in performance of the power clean. Differences in posttest performances with the mirror reflected the type of feedback (with or without the mirror) available during training.  相似文献   
188.
Previous research has suggested that women with a negative emotional orientation toward sexuality (i.e., erotophobia) have difficulty learning and retaining sexually relevant material such as contraceptive information. It has been hypothesized that these women become aroused by this material and that this arousal interferes with their ability to learn it. The importance of this issue led us to conduct the current study. Erotophobic and erotophilic women viewed presentations about contraception while their physiological responses were being monitored. In addition, they were tested on the information contained in the presentation before, immediately after, and again 4-6 weeks after the presentation. The results indicated that the erotophobic women knew less contraceptive information before the presentation and were more aroused by the presentation. This arousal, however, did not interfere with retention of the material. These results are discussed in terms of individual differences in reactions to sexual material and the ability to learn, retain, and use contraceptive information.  相似文献   
189.
190.
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