contact是接触器，早晚会烧的和继电器一样。以前倒是有水银开关就是真空的。

来源: chinomango 于 2022-08-14 20:41:37 [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.