Excessive vibration of an automatically fired auxiliary boiler can be caused by （）<br>A:air or water in the furnace<br>B:combustion pulses<br>C:fuel oil pump failure<br>D:flame failure

Excessive vibration of an automatically fired auxiliary boiler can be caused by （）
A:air or water in the furnace
B:combustion pulses
C:fuel oil pump failure
D:flame failure

出自：海船船员证

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