单选题Excessive vibration of an automatically fired auxiliary boiler can be caused by （）Aair or water in the furnaceBcombustion pulsesCfuel oil pump failureDflame failure
单选题
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
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