发布时间:2025-02-04 21:45:11
开关不带电合闸时,用万用表电阻档测量空气开关对应的输入、输出端,电阻为零;开关不带电分闸时,用万用表电阻档测量空气开关对应的输入、输出端,电阻接近于无穷大。那就说明空气开关是好的。
张家港二手房105万购买首付32万再月供3901元商贷多少万多少年
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