antedate
发表于 2025-4-1 05:44:44
9楼
patriarch
发表于 2025-4-1 07:59:01
10楼
下垂
发表于 2025-4-1 13:21:03
10楼
贪婪地吃
发表于 2025-4-1 15:49:01
10楼
Sad570
发表于 2025-4-1 20:46:14
Plutoniumetals both in its origin and behaviour. It is a synthetic material in the sense that it does not occur naturally as such but is artificially produced in nuclear reactors from uranium-238 by neutron absorption.