Which of the following problems can cause fluctuating pressures in the closed cooling system of a main propulsion diesel engine?（）<br>A:Defective temperature controls in the system<br>B:Cavitation in the cooling water pump<br>C:Opened vent in the cooling system<br>D:Restricted water passages in the engine

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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