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Nuclear weapons:
http://nuclearweaponarchive.org/Nwfaq/Nfaq0.html
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2 Z$ U9 }7 a: j6 ^Weapons 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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& {- M& Q. g! @: W* GNuclear 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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* {4 S4 I3 U5 b* ~2 G0 e' {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:
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- I* I' X2 l* o: _  i8 K0 X3 Y9 ]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:
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critical mass
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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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$ r0 v4 P! U1 o/ _5 |5 F[ 本帖最后由 墨涟 于 2008-10-24 15:04 编辑 ]