单选题Which of the following problems can cause fluctuating pressures in the closed cooling system of a main propulsion diesel engine?（）ADefective temperature controls in the systemBCavitation in the cooling water pumpCOpened vent in the cooling systemDRestricted water passages in the engine
单选题
Which of the following problems can cause fluctuating pressures in the closed cooling system of a main propulsion diesel engine?（）
A
Defective temperature controls in the system
B
Cavitation in the cooling water pump
C
Opened vent in the cooling system
D
Restricted water passages in the engine
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