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Nuclear weapons:
http://nuclearweaponarchive.org/Nwfaq/Nfaq0.html
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  K. }5 z# f: ?; GWeapons 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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$ p2 W' P! c5 Q# R1 z/ f6 ~8 rNuclear 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:
* s$ Z0 p% P- Z5 G* Y/ S<http://find.galegroup.com/gvrl/i ... 925&version=1.0>

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- z; V# v9 k8 JClark, 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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& \: u; A$ L4 h6 b; r7 dLerner, 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
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
& R# f  J4 v# v. i/ \) r" b<http://www.thefreedictionary.com/critical+mass>

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9 \( _" P9 w* i; N" s& r7 W: `[ 本帖最后由 墨涟 于 2008-10-24 15:04 编辑 ]