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   5248篇
  免费   229篇
  2020年   74篇
  2019年   94篇
  2018年   137篇
  2017年   139篇
  2016年   146篇
  2015年   96篇
  2014年   113篇
  2013年   1783篇
  2012年   129篇
  2011年   146篇
  2010年   120篇
  2009年   109篇
  2008年   108篇
  2007年   100篇
  2006年   86篇
  2005年   52篇
  2004年   70篇
  2003年   64篇
  2002年   52篇
  2001年   56篇
  2000年   67篇
  1999年   65篇
  1998年   46篇
  1997年   45篇
  1996年   46篇
  1995年   49篇
  1994年   43篇
  1992年   41篇
  1991年   42篇
  1990年   37篇
  1989年   50篇
  1988年   41篇
  1987年   43篇
  1986年   50篇
  1985年   63篇
  1984年   56篇
  1983年   64篇
  1982年   44篇
  1981年   57篇
  1980年   60篇
  1979年   57篇
  1978年   60篇
  1977年   52篇
  1976年   51篇
  1975年   46篇
  1974年   39篇
  1973年   50篇
  1972年   36篇
  1971年   38篇
  1969年   41篇
排序方式: 共有5477条查询结果,搜索用时 15 毫秒
1.
2.
Traditional understandings of the development of the medieval English longbow and its role in the fourteenth-century ‘infantry revolution’ have recently been challenged by historians. This article responds to the revisionists, arguing based on archaeological, iconographic and textual evidence that the proper longbow was a weapon of extraordinary power, and was qualitatively different from – and more effective than – the shorter self-bows that were the norm in England (and western Europe generally) before the fourteenth century. It is further argued that acknowledging the importance of the weapon as a necessary element of any credible explanation of English military successes in the era of the Hundred Years War does not constitute ‘technological determinism’.  相似文献   
3.
4.
Summary. Recent archaeological work has thrown fresh light on the region of Moravia and SW Slovakia (ČSSR) at the time of the Roman Empire. It is now apparent that, as on other frontiers, Roman influence extended far beyond the Danubian Limes . This paper describes six sites with Roman-style masonry buildings; one of the sites, Mušov, has produced evidence of Roman military occupation and is associated with the Marcomannic Wars of Marcus Aurelius; the other five, however, are of civilian character with an interesting admixture of Roman and German structures and artefacts. These sites provide us with an insight into the relationship of the client kingdom of the Quadi with Rome.  相似文献   
5.
6.
The Late Neolithic of southeast Hungary is known almost exclusively from excavations of large settlement mounds, or tells. Geochemical analyses of sediments collected from boreholes at small, flat Late Neolithic and Early Copper Age settlements in Hungary's Körös River basin provide data necessary to interpret the spatial organization of small settlements for the first time in this region. Principal Components Analysis of multi-element data produced a workable number of variables. Spatial analyses of these components via interpolation in ArcGIS 9 identified specific task areas, and when combined with sediment characterizations, phosphate ‘spot-tests’ and pH, suggest long-term cultural traditions in the location of activity zones within small farmsteads. The results demonstrate the usefulness of multi-element geochemistry as an intra-site prospection method.  相似文献   
7.
8.
9.
An investigation of three Andean towns in their regional setting forms the basis for an assessment of urban-rural demographic differences. The towns are found to have been ethnically distinct, with a larger proportion of whites than the mainly Indian rural areas. The urban populations also had a larger surplus of women, lower average marriage ages for women but lower proportions married, a higher illegitimacy rate and a slightly older age structure. Trends in urban districts differed from those in rural areas. The towns suffered major population losses, and their share of the regional population fell from nearly 10% in 1778 to around 5% in 1841. The factors affecting population trends are examined in order to identify those which had a differential urban-rural impact. Earthquake and warfare were of key significance. In a regional context of economic depression and population stagnation, these two catastrophes instigated a major urban recession. The three towns shared in the urban decline experienced in many parts of Latin America, but their recession was particularly pronounced owing to the impact of catastrophes.  相似文献   
10.
ABSTRACT. This paper uses a large data base to study metropolitan labor demand functions. The data are disaggregated by two-digit SICs in manufacturing for SMS As, and are corrected for changing SMSA boundaries. Labor demand elasticities are estimated for factor and commodity prices, transportation costs, state and local taxes and expenditures, and production-function shifters. Estimates from different years allow one to test Le Chatelier's principle in the context of interregional change.  相似文献   
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