单选题The main propulsion diesel engine jacket water temperature rises above normal, with the raw water sea suction and the expansion tank water level being normalWhich of the following problems is most likely the cause?（）AFaulty thermostatic bypass valveBEroded zinc pencils in the heat exchangerCSteam formation in the expansion tankDExcessive leakage from jacket water pump seal
单选题
The main propulsion diesel engine jacket water temperature rises above normal, with the raw water sea suction and the expansion tank water level being normalWhich of the following problems is most likely the cause?（）
A
Faulty thermostatic bypass valve
B
Eroded zinc pencils in the heat exchanger
C
Steam formation in the expansion tank
D
Excessive leakage from jacket water pump seal
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