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   13703篇
  免费   1192篇
  国内免费   30篇
耳鼻咽喉   140篇
儿科学   352篇
妇产科学   266篇
基础医学   1878篇
口腔科学   332篇
临床医学   1569篇
内科学   2633篇
皮肤病学   147篇
神经病学   1111篇
特种医学   481篇
外科学   2050篇
综合类   272篇
一般理论   13篇
预防医学   1542篇
眼科学   206篇
药学   899篇
中国医学   5篇
肿瘤学   1029篇
  2022年   96篇
  2021年   221篇
  2020年   132篇
  2019年   226篇
  2018年   282篇
  2017年   198篇
  2016年   171篇
  2015年   202篇
  2014年   320篇
  2013年   523篇
  2012年   813篇
  2011年   874篇
  2010年   419篇
  2009年   389篇
  2008年   733篇
  2007年   768篇
  2006年   756篇
  2005年   719篇
  2004年   668篇
  2003年   597篇
  2002年   624篇
  2001年   358篇
  2000年   324篇
  1999年   283篇
  1998年   160篇
  1997年   114篇
  1996年   109篇
  1995年   114篇
  1994年   105篇
  1993年   133篇
  1992年   224篇
  1991年   199篇
  1990年   223篇
  1989年   189篇
  1988年   163篇
  1987年   168篇
  1986年   167篇
  1985年   162篇
  1984年   143篇
  1983年   108篇
  1982年   89篇
  1981年   93篇
  1980年   97篇
  1979年   133篇
  1978年   102篇
  1976年   93篇
  1975年   89篇
  1974年   102篇
  1973年   96篇
  1972年   99篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Malignancy larynx usually presents early, the common symptoms being hoarseness, pain thorat, cough and irritation of throat. An advanced malignancy is likely to be complicated by a pharyngo-cutaneous fistula. However it is an occurrence towards the end stage of the disease. Here we present a case of malignancy larynx primarily presenting as pharyngo-cutaneous fistula without any other symptoms.  相似文献   
3.
Cancer Chemotherapy and Pharmacology - Addition of solid doxorubicin or solutions to pre-formed liposomes proved to be the optimal method for incorporating the drug into liposomes whilst...  相似文献   
4.
5.
In lung cancer patients, hypercalcemia is a fairly common metabolic problem associated with malignancy. However, the occurrence of hypercalcemia in lung cancer patients means an ominous prognostic sign. As hypercalcemia often causes early death, quick diagnosis and treatment for hypercalcemia are required. A 69-year-old woman was admitted to our hospital with anorexia caused by hypercalcemia. On admission, serum level of PTH was elevated and PTHrP was normal. From the results of CT findings and transbronchial lung biopsy, the cause of the hypercalcemia was determined as lung cancer incidentally complicated with primary hyperparathyroidism. First, serum calcium level was returned to normal through hydration with saline and bisphosphonates. Next, left hemithyroidectomy for primary hyperparathyroidism was performed. Histologically, the tumor was diagnosed as parathyroid adenoma. Fifteen days later, left lower lobectomy for primary lung cancer was performed under a video-assisted thoracoscopic approach. Histologically, the tumor was diagnosed as a moderately differentiated adenocarcinoma. Four years and three months after the operation, the patient is alive and well with no sign of recurrence. When a lung cancer patient is complicated with hypercalcemia, we need to consider that primary hyperparathyroidism is a possible cause of the hypercalcemia.  相似文献   
6.
7.
8.
This study evaluated the effects of tobacco Purchase, Use and Possession (PUP) laws on student perceptions of adolescent tobacco use within towns and schools. Twenty‐four towns were randomly assigned into two conditions, the experimental condition (E PUP) involved efforts to increase both PUP law enforcement and reduce minors' access to commercial sources of tobacco, whereas the control condition (C) focused only on efforts to reduce minors' access to commercial sources of tobacco. A hierarchical linear modeling analytical approach was selected due to the multilevel data and nested design. The present study found that over time, youth in the experimental PUP condition observed less youth tobacco usage at school and in their town, and perceived lower rates of tobacco among their peers at school and among friends than youth in the control condition. The findings suggest that PUP law enforcement might be used to strengthen community norms against youth tobacco use.  相似文献   
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