If a DC motor runs hot, the cause may be （）<br>A:high mica condition<br>B:low ambient temperature<br>C:clogged ventilation ducts<br>D:an open in the shunt field

If a DC motor runs hot, the cause may be （）
A:high mica condition
B:low ambient temperature
C:clogged ventilation ducts
D:an open in the shunt field

出自：海船船员证

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