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发表于 2008-10-22 14:14 | 显示全部楼层 |阅读模式
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Nuclear weapons:
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Weapons of Mass Destruction. (2003). In Harvey Kushner (Ed.), Encyclopedia of Terrorism, Vol. 1. (404-406). Thousand Oaks: Sage Reference. Retrieved October 22, 2008,  from Gale Virtual Reference Library via Gale:
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" Q1 H6 l8 q$ s; W9 J! ]5 `+ \, c: B  wNuclear Weapons. (2006). Encyclopedia of Modern Europe: Europe Since 1914: Encyclopedia of the Age of War and Reconstruction, Vol. 4. (1891-1898). Retrieved October 22, 2008,  from Gale Virtual Reference Library via Gale:
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Clark, Roger. (2005). Nuclear Weapons. In Dinah Shelton (Ed.), Encyclopedia of Genocide and Crimes Against Humanity, Vol. 2. (754-761). Detroit: Macmillan Reference USA. Retrieved October 22, 2008,  from Gale Virtual Reference Library via Gale:
$ ^: x$ K+ [( o. O<http://find.galegroup.com/gvrl/i ... 925&version=1.0>
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Lerner, K. Lee, Gilman, Larry, & Haycock, Dean Allen. (2004). Nuclear Weapons. In K. Lee Lerner & Brenda Lerner (Eds.), Gale Encyclopedia of Science, Vol. 4. (3rd ed., 2816-2821). Detroit: Gale. Retrieved October 22, 2008,  from Gale Virtual Reference Library via Gale:
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  G0 T* N" j1 n' `  x# y  ucritical mass
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. h4 Y# ^5 M  u& l1 k- |: E& `8 n/ @1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.
+ o/ L* d0 D" L/ ?6 K2. The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe# C2 F) e1 o: _4 N4 ]: T
<http://www.thefreedictionary.com/critical+mass># p' h9 ?9 E8 u4 e

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