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Nuclear weapons:
http://nuclearweaponarchive.org/Nwfaq/Nfaq0.html
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3 `- z2 ~! n! CWeapons 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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$ p  ?* W1 _* v7 i, u' o  P7 lNuclear 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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. }( @$ j8 H# p" O8 C6 XClark, 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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/ B) t/ \( b* _3 T0 f9 d  @/ oLerner, 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:
$ q; T4 P  E+ e5 H( q  e2 T/ v<http://find.galegroup.com/gvrl/i ... 925&version=1.0>

critical mass
n.
1. 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
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6 V* B9 ^! {: h  W1 p5 a[ 本帖最后由 墨涟 于 2008-10-24 15:04 编辑 ]