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Nuclear weapons:
http://nuclearweaponarchive.org/Nwfaq/Nfaq0.html
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$ s4 G+ X* j( p! K! Z0 b0 w0 l0 jWeapons 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:
<http://find.galegroup.com/gvrl/i ... 925&version=1.0>

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$ a: @! |7 I1 y6 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:
# v5 q/ y  C; {: m8 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:
# J7 e5 ]* c$ T8 ~<http://find.galegroup.com/gvrl/i ... 925&version=1.0>

critical mass
n.
% q; U6 w' r( I) I0 c1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.
2. The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe
- l! }- m0 C! h6 u9 f1 \4 @0 E<http://www.thefreedictionary.com/critical+mass>
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2 t( B: O4 G3 b6 T2 e. p[ 本帖最后由 墨涟 于 2008-10-24 15:04 编辑 ]