If the electric motor driving an air compressor fails to start, the cause may be a （）.<br>A:leaking unloader<br>B:tripped circuit breaker<br>C:control line leak<br>D:defective pop valve

If the electric motor driving an air compressor fails to start, the cause may be a （）.
A:leaking unloader
B:tripped circuit breaker
C:control line leak
D:defective pop valve

出自：海船船员证

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