二十年了，很可能某些结构松动变形导致共振频率改变。天朝工程都不是指着用一百年的，拆了重建又是GDPGDP

来源: 二胡一刀于 2020-05-05 13:22:27 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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