全文获取类型
收费全文 | 371977篇 |
免费 | 25416篇 |
国内免费 | 8178篇 |
专业分类
耳鼻咽喉 | 4822篇 |
儿科学 | 10273篇 |
妇产科学 | 7096篇 |
基础医学 | 32537篇 |
口腔科学 | 8470篇 |
临床医学 | 44169篇 |
内科学 | 46881篇 |
皮肤病学 | 4916篇 |
神经病学 | 22281篇 |
特种医学 | 8708篇 |
外国民族医学 | 36篇 |
外科学 | 38588篇 |
综合类 | 53356篇 |
现状与发展 | 14篇 |
一般理论 | 32篇 |
预防医学 | 37275篇 |
眼科学 | 5659篇 |
药学 | 33184篇 |
420篇 | |
中国医学 | 31220篇 |
肿瘤学 | 15634篇 |
出版年
2023年 | 5994篇 |
2022年 | 8848篇 |
2021年 | 14747篇 |
2020年 | 13842篇 |
2019年 | 19370篇 |
2018年 | 17050篇 |
2017年 | 14028篇 |
2016年 | 11602篇 |
2015年 | 10965篇 |
2014年 | 21835篇 |
2013年 | 24260篇 |
2012年 | 19924篇 |
2011年 | 21497篇 |
2010年 | 17266篇 |
2009年 | 16098篇 |
2008年 | 15625篇 |
2007年 | 15981篇 |
2006年 | 14080篇 |
2005年 | 12141篇 |
2004年 | 9988篇 |
2003年 | 8757篇 |
2002年 | 6855篇 |
2001年 | 6171篇 |
2000年 | 5137篇 |
1999年 | 4518篇 |
1998年 | 3688篇 |
1997年 | 3498篇 |
1996年 | 3027篇 |
1995年 | 2987篇 |
1994年 | 2820篇 |
1993年 | 2216篇 |
1992年 | 2248篇 |
1991年 | 1964篇 |
1990年 | 1722篇 |
1989年 | 1553篇 |
1988年 | 1451篇 |
1987年 | 1260篇 |
1985年 | 4048篇 |
1984年 | 5036篇 |
1983年 | 3503篇 |
1982年 | 4008篇 |
1981年 | 3689篇 |
1980年 | 3305篇 |
1979年 | 3033篇 |
1978年 | 2603篇 |
1977年 | 1966篇 |
1976年 | 2212篇 |
1975年 | 1675篇 |
1974年 | 1462篇 |
1973年 | 1315篇 |
排序方式: 共有10000条查询结果,搜索用时 281 毫秒
51.
目的 探讨肿瘤位置、最大直径及甲状腺外浸等临床病理特征与甲状腺癌前上纵隔淋巴结转移的关系。 方法 研究分析初次手术治疗的60例甲状腺乳头状癌患者临床及病理资料,运用检验临床病理特征与前上纵隔淋巴结阳性率的相关性。 结果 肿块位置、最大直径、数量、腺体外侵、受累腺叶数及Ⅵ区淋巴结转移等特征,以及患者年龄等相关因素中,只有VI区淋巴结对前上纵隔淋巴结状态有影响;60例患者前上纵隔淋巴结转移率为10/60(16.67%)。相关因素的前上纵隔淋巴结转移率对比:≥55岁vs <55岁(20% vs 16.36%, P<0.05);肿块位于下极 vs 上极 vs 中极(P>0.05);最大直径≥1.5 cm vs 最大直径<1.5 cm(18.18% vs 15.79, P>0.05);单灶 vs 多灶(21.88% vs 10.71%, P>0.05);单叶 vs 多叶(17.5% vs 15%, P>0.05);男性vs女性(20% vs 15.55%, P>0.05); Ⅵ区淋巴结阳性vs 阴性(24.43% vs 3.57%, P<0.05); 结论 总体来说,甲状腺乳头状癌前上纵隔淋巴结转移率较低。本研究发现VI区淋巴结状态可能与前上纵隔淋巴结转移相关,未来仍需大样本前瞻性的研究验证。 相似文献
52.
目的:观察理筋通督手法治疗颈性眩晕的临床疗效。方法:将120例颈性眩晕患者随机分成3组,理筋通督组、传统手法组及安慰剂组。理筋通督组采用理筋通督手法;传统手法组采用传统手法;安慰剂组口服维生素C。结果:理筋通督手法可显著减缓患者基底动脉舒张期最低血流速度(P0.05)。理筋通督组有效率为93.67%,传统手法组有效率为67.5%,安慰剂组有效率为17.5%,3组比较差异有统计学意义(P0.05),理筋通督组明显优于其他两组。结论:理筋通督手法治疗颈性眩晕临床疗效显著。 相似文献
53.
Tonya J.H. White 《Journal of the American Academy of Child and Adolescent Psychiatry》2019,58(11):1042-1050
54.
Daniel Schar Pawin Padungtod Nguyen Tung Michael OLeary Wantanee Kalpravidh Filip Claes 《Influenza and other respiratory viruses》2019,13(6):618-621
Among the chief limitations in achieving early detection and control of animal‐origin influenza of pandemic potential in high‐risk livestock populations is the existing lag time between sample collection and diagnostic result. Advances in molecular diagnostics are permitting deployment of affordable, rapid, highly sensitive, and specific point‐of‐capture assays, providing opportunities for targeted surveillance driving containment strategies with potentially compelling returns on investment. Interrupting disease transmission at source holds promise of disrupting cycles of animal‐origin influenza incursion to endemicity and limiting impact on animal production, food security, and public health. Adoption of new point‐of‐capture diagnostics should be undertaken in the context of promoting robust veterinary services systems and parallel support for operationalizing pre‐authorized plans and communication strategies that will ensure that the full potential of these new platforms is realized. 相似文献
55.
目的探究面肌痉挛患者微血管减压术(MVD)中异常肌反应(AMR)的变化特点与术后疗效的关系。方法回顾性分析73例MVD术中采用AMR全程定量化监测患者的AMR变化特点,减压操作前AMR阈值较基础阈值升高≥1倍为A1组、1倍为A2组,手术结束时AMR完全消失为B1组、未消失为B2组,B2组中AMR阈值较基础阈值升高≥1倍为B2a组、1倍为B2b组,对各组的术后疗效进行对比分析。结果 A1组21例中,19例立即治愈,1例延迟治愈,1例未愈; A2组52例中,35例立即治愈,9例延迟治愈,8例未愈。A1组较A2组疗效好(P=0. 046)。B1组50例中,42例立即治愈,5例延迟治愈,3例未愈; B2组23例中,12例立即治愈,5例延迟治愈,6例未愈。B1组较B2组疗效好(P=0. 003)。B2 a组的治愈比例较B2 b组高(分别为14/16、3/7),差异有统计学意义(P=0. 045)。结论 AMR在术中的变化特点对术者有重要参考意义,AMR在减压前升高、在手术结束时完全消失、未消失但升高较基础阈值≥1倍者术后疗效相对较好。 相似文献
56.
57.
Pregnancy can be complicated with different surgical emergencies which may potentially endanger the mother as well as foetus. In the modern era of advanced diagnostics and treatments, neither of them in response to a surgical emergency in a pregnant woman should be delayed. Appropriate early intervention is essential to decrease the morbidity and mortality. Following article encompasses common surgical emergencies that can arise in a pregnant woman and tries to suggest the approach that may be taken to reduce the burden of morbidity and mortality. 相似文献
58.
Effects of the Clearing the Lung and Dissipating Phlegm Method in the Treatment of Acute Exacerbation of Chronic Obstructive Pulmonary Disease: A Systematic Review and Meta-Analysis 下载免费PDF全文
Tao Zhang Yao-Hui Li Gai-Xia Liu Xiu-Lin Tang 《World Journal of Traditional Chinese Medicine》2019,(1)
Objective: The objective of this study is to evaluate the efficacy and safety of the clearing the lung and dissipating phlegm method in the treatment of acute exacerbation of chronic obstructive pulmonary disease(COPD) and to provide evidence for the treatment of the disease. Materials and Methods: Literature was searched from the United States National Library of Medicine(PubMed), Embase, Cochrane Library, China National Knowledge Infrastructure, Wanfang Database(Wanfang), and the Full?Text Database of Chinese Scientific and Technical Periodicals(VIP).A comprehensive collection was made of randomized controlled trials(RCTs) before June 2018, in which the treatment groups used either the clearing the lung and dissipating phlegm formulas only or combined it with routine Western medicine therapy, and the control group adopted routine Western medicine therapy only for the acute exacerbation of COPD. The Cochrane risk of bias method was used to evaluate the quality of the literature. The data were analyzed and retrieved independently by two reviewers before meta?analysis was carried out with RevMan 5.3 software to evaluate the primary outcome measures, including the total clinical effective rate, and the secondary outcome measures such as the pulmonary function(forced vital capacity [FVC], forced expiratory volume in the 1 s [FEV1], percentage of FEV1 [FEV1%], and FEV1/FVC)and blood gases(PaO_2 and PaCo_2). Results: A total of 13 RCTs involving 990 patients(496 in the treatment group and 494 in the control group)were included in this study. Meta?analysis revealed significant difference in the efficacy of the group that adopted solely the routine Western medicine method and the group that combined the Western medicine with the clearing the lung and dissipating phlegm method. Outcome measures including the pulmonary function(FVC, FEV1, FEV1%, and FEV1/FVC) and the blood gases(PaO_2 and PaCo_2) were significantly improved as compared to the control group(P 0.00001). However, adverse effects in the treatment group using combined traditional Chinese medicine were not reported due to the short observation time of the study. Conclusion: The clearing the lung and dissipating phlegm method can improve the efficacy in the treatment of acute exacerbation of COPD, the outcome measures of the pulmonary function and the blood gases,as well as the life quality of the patients. However, due to the fact that the existing studies are generally of poor quality in which randomization and its implementation were not properly carried out, more high?quality RCTs are necessary to confirm the findings of this study. 相似文献
59.
60.