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   8317篇
  免费   318篇
  2020年   95篇
  2019年   148篇
  2018年   454篇
  2017年   386篇
  2016年   436篇
  2015年   167篇
  2014年   171篇
  2013年   2241篇
  2012年   200篇
  2011年   349篇
  2010年   342篇
  2009年   210篇
  2008年   239篇
  2007年   295篇
  2006年   126篇
  2005年   129篇
  2004年   82篇
  2003年   94篇
  2002年   94篇
  2001年   104篇
  2000年   95篇
  1999年   89篇
  1998年   91篇
  1997年   86篇
  1996年   60篇
  1995年   74篇
  1994年   59篇
  1993年   59篇
  1992年   63篇
  1991年   46篇
  1990年   57篇
  1989年   45篇
  1988年   61篇
  1987年   73篇
  1986年   56篇
  1985年   82篇
  1984年   85篇
  1983年   85篇
  1982年   92篇
  1981年   77篇
  1980年   72篇
  1979年   72篇
  1978年   75篇
  1977年   81篇
  1976年   63篇
  1975年   49篇
  1974年   49篇
  1973年   41篇
  1972年   33篇
  1971年   32篇
排序方式: 共有8635条查询结果,搜索用时 15 毫秒
81.
82.
243 blacksmiths in Sierra Leone were interviewed in 1984-85 in an effort to focus on both the activities and attitudes of traditional blacksmiths in the country's economy. Due to the fact of an shortage of foreign exchange with which to import and maintain equipment, agriculture using high-technology equipment accounts for less than 15% of total production. Consequently, blacksmiths are vital to the nations' survival, despite prevailing attitudes toward them. The interviews were conducted in 9 of the 12 districts in Sierra Leone. The blacksmith operates not simply in terms of producing and servicing goods; cultural values frame his position in the community. In all of West Africa, and particularly among Mende-related peoples, there historically exists a mystique surrounding a blacksmith. In some societies, blacksmiths were believed to be witches. The arguments that most likely could account for this would probably lie in the fact that the blacksmith made farm tools and weapons of war, means of survival in the community. Thus, his position was vital. Traditionally the importance of the smith's profession lies in the fact that some of the implements he fabricates and the materials he uses are believed to provide elements of social control or to have healing powers. An appreciation of the cultural significance of the blacksmith demonstrates the degree of attachment of the population to this profession as well as the context within which one could relate to possible technological changes in the trade. An attempt was made in the interview to gather some information about levels of production. The figures represent averages, and production capacity varied owing to a number of factors, including the degree of organization of the unit, the capacity of the head of the forge to keep his team busy when work was intensive, and the degree of energy and determination of an operator to get the greatest amount of work done in 1 day. The most obvious factor influencing production levels was the size of the units. Pricing of commodities and the blacksmith's services depended on a combination of factors, but, generally, in semi-urban areas, where more impersonal relationships tended to obtain, prices appeared relatively more fixed than in rural areas. All smiths interviewed complained about the increasing scarcity of scrap iron. As there is every reason to envisage a continued dependence on informal-sector production by blacksmiths, official attitudes need to take these trades more seriously.  相似文献   
83.
84.
A method is described for the identification of the origin of flint artefacts. The method is based on the variation in the trace element concentrations for different origins. The trace element concentrations were determined by non-destructive neutron activation analysis. The identification was obtained from a pattern recognition analysis.  相似文献   
85.
86.
87.
88.
89.
Reviews of books     
Historical Archaeology -  相似文献   
90.
Reviews     
DYNAMICS OF WORLD POLITICS: STUDIES IN THE RESOLUTION OF INTERNATIONAL CONFLICT. Linda B. Miller (ed.). Prentice‐Hall, 1968. Pp. viii + 294. $5.40.

THE UNITED NATIONS AND UNITED STATES SECURITY POLICY. Ruth B. Russell. The Brookings Institution, Washington, D.C., 1968. Pp. ix + 510. $10.00 (U.S.).

THE POLITICS OF PEACE‐KEEPING. Alan James. Studies in International Security: 12. Chatto & Windus, London, for The Institute for Strategic Studies, 1969. Pp. 452. £.3.3.0.

INTERNATIONAL INFORMATION CENTER ON PEACE‐KEEPING OPERATIONS MONOGRAPHS NOS. 6–8. Paris, 1968. $1.00 each.

No. 6 CHARACTERISTICS AND SOME ASPECTS OF LAUNCHING U.N. PEACE‐KEEPING FORCES. Lieut.‐General P. S. Gyani. Pp. 13.

No. 7 PEACE‐KEEPING AND SELF‐DEFENCE. Dr Kjell Goldmann. Pp. 60.

No. 8 THE AUTHORIZATION OF PEACE‐KEEPING OPERATIONS IN TERMS OF THE NATURE OF THE CONFLICT. Albert Legault. Pp. 62

CANADA AND THREE CRISES. Robert W. Reford. Toronto, Canadian Institute of International Affairs, 1968. Pp. xii + 246. $5.00 (Canadian).

SYSTEMS, STATES, DIPLOMACY AND RULES. J. W. Burton. Cambridge University Press, 1968. Pp. xii + 251. $7 (U.S.).

GERMAN FOREIGN POLICY IN TRANSITION. BONN BETWEEN EAST AND WEST. Karl Kaiser. Issued under the joint auspices of the Harvard University Center for International Affairs, the Twentieth Century Fund's ‘Tocqueville Series’ and the Royal Institute of International Affairs. London, Oxford University Press, Oxford Paperbacks No. 159, 1968. Pp. x + 153. $2.00.

PEOPLE'S WAR. THE CONDITIONS AND THE CONSEQUENCES IN CHINA AND IN SOUTH‐EAST ASIA. J. L. S. Girling. London, Allen and Unwin, 1969. Pp. 244. $6.65.

ASIAN CONTRACT LAW. David Allan (General Editor). Melbourne University Press, 1969. Pp. xiii + 237. $9.60.

MODERN FEDERALISM. G. F. Sawer. The New Thinker's Library, No. 29. London, C. A. Watts & Co., 1969. Pp. 204. 15/‐ (U.K.).  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