单选题Sparking at the brushes of a running motor could be an indication of （）.Anormal operationBa dirty commutatorCincreased brush capacityDwater vapor absorption
单选题
Sparking at the brushes of a running motor could be an indication of （）.
A
normal operation
B
a dirty commutator
C
increased brush capacity
D
water vapor absorption
参考解析
解析：
暂无解析
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