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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:7 P+ O) d5 e! S4 M; J5 E: X
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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: 5 n8 n1 S3 g& b  F
<http://find.galegroup.com/gvrl/i ... 925&version=1.0>
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Nuclear 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: 2 w9 m/ _+ t+ S
<http://find.galegroup.com/gvrl/i ... 925&version=1.0>% E7 P( G' P4 `, h( c

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. t! S: i% G' p5 p7 w" U9 qClark, 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:
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' Q0 x* Q! L, b" ]5 |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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critical mass& @. }4 n% m0 V! v+ [3 g2 R
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. M% u& a2 ~! \6 z1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.
! F7 L" L+ \' C( ~) ]! r5 O2. The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe+ G# X% X4 @. S
<http://www.thefreedictionary.com/critical+mass>1 x. @4 ~( }" k) i3 k& L$ h

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[ 本帖最后由 墨涟 于 2008-10-24 15:04 编辑 ]
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