发布时间:2025-02-04 22:14:57
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。
墙纸发霉是返潮还是返水墙纸发霉撕掉后墙面如何处理墙布发霉变黑怎么处理
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