材料稳定性一直是致命的。八十年代黄昆的学生对我说他们他们基本是拿票子堆的成本。。

来源: borisg 于 2020-10-08 18:04:02 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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