全文获取类型
收费全文 | 19942篇 |
免费 | 2046篇 |
国内免费 | 27篇 |
专业分类
耳鼻咽喉 | 126篇 |
儿科学 | 643篇 |
妇产科学 | 739篇 |
基础医学 | 2969篇 |
口腔科学 | 529篇 |
临床医学 | 2368篇 |
内科学 | 3961篇 |
皮肤病学 | 296篇 |
神经病学 | 1824篇 |
特种医学 | 532篇 |
外科学 | 2494篇 |
综合类 | 495篇 |
一般理论 | 17篇 |
预防医学 | 2063篇 |
眼科学 | 219篇 |
药学 | 1703篇 |
中国医学 | 32篇 |
肿瘤学 | 1005篇 |
出版年
2021年 | 231篇 |
2020年 | 158篇 |
2019年 | 256篇 |
2018年 | 302篇 |
2017年 | 206篇 |
2016年 | 252篇 |
2015年 | 305篇 |
2014年 | 404篇 |
2013年 | 619篇 |
2012年 | 900篇 |
2011年 | 933篇 |
2010年 | 526篇 |
2009年 | 503篇 |
2008年 | 801篇 |
2007年 | 964篇 |
2006年 | 884篇 |
2005年 | 772篇 |
2004年 | 849篇 |
2003年 | 785篇 |
2002年 | 749篇 |
2001年 | 697篇 |
2000年 | 685篇 |
1999年 | 623篇 |
1998年 | 243篇 |
1997年 | 234篇 |
1996年 | 202篇 |
1995年 | 207篇 |
1994年 | 163篇 |
1993年 | 173篇 |
1992年 | 512篇 |
1991年 | 498篇 |
1990年 | 436篇 |
1989年 | 528篇 |
1988年 | 427篇 |
1987年 | 390篇 |
1986年 | 438篇 |
1985年 | 353篇 |
1984年 | 300篇 |
1983年 | 317篇 |
1982年 | 171篇 |
1981年 | 161篇 |
1979年 | 242篇 |
1978年 | 182篇 |
1977年 | 158篇 |
1976年 | 157篇 |
1974年 | 153篇 |
1973年 | 182篇 |
1972年 | 152篇 |
1971年 | 160篇 |
1970年 | 139篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
73.
74.
75.
W B Campbell H Decaluwe V Boecxstaens J A MacIntyre N Walker J F Thompson A R Cowan 《European journal of vascular and endovascular surgery》2007,34(6):741-744
OBJECTIVES: To investigate the activities which may exacerbate symptoms in patients with varicose veins. METHODS: Questionnaires sent to patients before clinics and at least six months later. RESULTS: Both questionnaires were returned by 149 of 203 patients (74%) but only 124 contained adequate data for comparison--55 from patients who had surgical treatment and 69 who had no surgery. At initial presentation, worsening of discomfort attributed to varicose veins was common during (58%) or after (48%) standing and in hot weather (44%), but less when sitting with the feet down (31%), and after (31%) or when walking (19%). Surgery significantly reduced the total number of symptoms reported by patients at follow-up (p<0.02). However, none of the symptoms reported during specific activities was significantly lessened by surgery compared with no treatment--possibly because the attrition of patients during the study resulted in small numbers for analysis. CONCLUSIONS: Symptoms are a common indication for treating varicose veins and it is therefore important to be sure that they are due to the veins, rather than other causes. This report highlights traditional and logical questions which may help to identify symptoms caused by varicose veins but illustrates the difficulty of validating them. 相似文献
76.
M Lukoschek D B Burr E R Walker R D Boyd E L Radin 《Zeitschrift für Orthop?die und ihre Grenzgebiete》1990,128(5):437-441
Surgical instability and repetitive impulsive loading was used to generate degenerative changes in knee joints of rabbits. Light- and electronmicroscopy was carried out at synovial membrane and cartilage samples. The instabilised joints had early synovial inflammation, preceding overall cartilage changes. Synoviocytes were activated and showed more and dilatated cytoplasmatic organells. Invaded round cells--potentially cartilage degenerative--were seen. In the loading model no initial synovial inflammation could be seen. Focal cartilage changes were located at the weight bearing zone. Two different inductive pathways may be involved in cartilage breakdown comparing the two arthrosis models. Mechanical factors seemed to trigger cartilage changes in the loading model, an inflammatory synovial pathway is likely to initiate cartilage breakdown in the instability model. Clinical relevance: The synovial membrane has the key-position for the cartilage degeneration in posttraumatic joint affections. The therapeutic use of antiphlogistic substances is indicated to supreme inflammatory mediators from the synovial membrane. This therapeutic concept seemed not to be useful in primary mechanical induced osteoarthrosis. 相似文献
77.
A study was conducted to see which attributes contribute most to financial distress in Catholic hospitals. The 1982 total population of U.S. Catholic hospitals was examined. The reason for financial distress was found to be more related to management attributes than to financial variables. 相似文献
78.
Originally conceived as a technique to assess how well current activities contribute to the attainment of organizational goals, portfolio analysis also can be used as a marketing research tool for considering the relative merits of various diversification options under consideration by institutional decision makers. The authors describe the features of portfolio analysis and its use as a tool in the evaluation of health care diversification options. A case study of a hospital that has employed the method in its corporate planning and marketing efforts illustrates the use of this analysis technique. 相似文献
79.
T.M. Walker 《Postgraduate medical journal》1993,69(818):962-963
80.
L Gourley S W Duffy H P Lee A M Walker N E Day 《European journal of clinical nutrition》1988,42(4):333-343
A survey of 40 Singapore Chinese households was performed, obtaining information on major perishable foods purchased for home consumption in the previous week, extent of home consumption (eating in), household dietary habits and housing type, the last as a measure of affluence. Eating out was very common: nine (23 per cent) households ate less than 50 per cent of meals at home. Excluding these nine households, consumption and habits were compared between more affluent and less affluent households. The more affluent households purchased more red meat/offal (P = 0.001), poultry (P = 0.002), vegetables other than green leafy (P = 0.04), fruit (P = 0.007) and eggs (P = 0.04); they also differed significantly in various dietary habits. Significant differences were also observed between English-speaking and Chinese-speaking households. The results suggest that increasing affluence may have brought about substantial dietary change in Singapore, thus meriting further study of the role of diet in changing disease patterns in Singapore. 相似文献