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Generally, the connection resistance is large, it may be that the joint connection is not good, and it is easy to overheat in the contact, and it must be rectified before it can be used, otherwise it is easy to burn the line or even fire.
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It's easy to understand, because you are measuring with an electric pen, and the measurement method is incorrect, and the line is normal.
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Before decoration, the floor and wall should be fixed, the floor tiles should be pasted, the floor drain should be tested, and so on.
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Many of the units are. Waterproofing must be done well.
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Yes, when the time comes, just make a cabinet to block it.