能说出半衰期，学理的。查查U和Pu的半衰减周期，乌克兰切尔电厂的封闭时间。

来源: 流浪之心于 2011-03-17 09:27:55 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.