断电是东西老旧，断电当然信号不好了。噪音是老旧机器引起，电梯，洗衣机，烘干机等等。

来源: iBear 于 2018-04-04 12:42:00 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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