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

4 i. q, R( V% U' y' l$ Z' \& S7 X1 sWeapons 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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Nuclear 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:
* ^# a* R& a0 |* G<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:
<http://find.galegroup.com/gvrl/i ... 925&version=1.0>
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( o, }5 y! v* FLerner, 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:
) Y7 {+ k/ J7 v& M<http://find.galegroup.com/gvrl/i ... 925&version=1.0>
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critical mass
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# q0 c) z/ Y! N1 r) Q: W) E1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.
4 r) `. o3 J/ x+ f. E$ _: H4 |2. The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe
<http://www.thefreedictionary.com/critical+mass>

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; r+ `( H4 F) ^( F! \0 r[ 本帖最后由 墨涟 于 2008-10-24 15:04 编辑 ]