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Nuclear weapons:
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/ F' j+ L6 P/ G+ ?- k# F! u# LWeapons 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 O3 ~6 S, i6 _' m# k$ U. w<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:
<http://find.galegroup.com/gvrl/i ... 925&version=1.0>
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( H) u; f2 P9 J! F3 o4 WClark, 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:
<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:
  W* B" j) [( Z! `" Y0 u<http://find.galegroup.com/gvrl/i ... 925&version=1.0>
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% {+ Z4 B3 t7 Q6 o, [  Ncritical mass
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1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.
1 D$ C& C. ~7 ~2 P2. The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe
<http://www.thefreedictionary.com/critical+mass>
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5 h% X& P5 ^% c% U1 V/ |( s+ H[ 本帖最后由 墨涟 于 2008-10-24 15:04 编辑 ]