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Nuclear weapons:
http://nuclearweaponarchive.org/Nwfaq/Nfaq0.html
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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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. x# ^3 c8 Y2 n9 G6 T7 E# |3 C# 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:
<http://find.galegroup.com/gvrl/i ... 925&version=1.0>
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0 b7 H5 r. z# H* L+ lClark, 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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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:
6 H5 h9 L" e! B9 y/ c4 W<http://find.galegroup.com/gvrl/i ... 925&version=1.0>

- _7 H; ^* m. Y3 {) \+ Gcritical mass
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% q5 s" X/ m0 W) [' b1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.
4 L% L+ f8 W3 P. g2. The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe
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0 R& u$ h" @6 T. F+ \& j[ 本帖最后由 墨涟 于 2008-10-24 15:04 编辑 ]