Electrical failures in motors are caused by the breakdown of insulation, which may be caused by （）<br>A:penetration of moisture<br>B:accumulation of dirt<br>C:overheating<br>D:All of the above

Electrical failures in motors are caused by the breakdown of insulation, which may be caused by （）
A:penetration of moisture
B:accumulation of dirt
C:overheating
D:All of the above

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