送交者: Amsel 于 2011-03-15, 10:16:36:

回答: what do you mean? 由 steven 于 2011-03-15, 10:00:52:

• if U238 meets fast neutrons, you will see a big big mashroom cloud. - steven (420 bytes) 2011-03-15, 11:42:12 (562141)
  • 不对吧，那为什么原子弹要提纯U235 - Amsel (322 bytes) 2011-03-15, 12:04:19 (562165)

加跟贴