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Nuclear weapons:
http://nuclearweaponarchive.org/Nwfaq/Nfaq0.html

/ Q/ r. [2 {+ Q# W0 D& @8 F6 b3 dWeapons 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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( q) X9 q) D* p: pNuclear 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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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:
( [0 Z1 p1 n, x2 R! t$ ]" w8 c<http://find.galegroup.com/gvrl/i ... 925&version=1.0>


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: S( l  l8 f$ V3 N+ eLerner, 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:
<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.
; G: b2 }& a3 ]* g4 B2. The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe
/ w; J0 @" N7 b9 ]<http://www.thefreedictionary.com/critical+mass>

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' j/ [- G/ K6 x" I[ 本帖最后由 墨涟 于 2008-10-24 15:04 编辑 ]