If the jacket water temperature in an auxiliary diesel engine cooling system is lower than

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If the jacket water temperature in an auxiliary diesel engine cooling system is lower than normal, the probable cause is .

A.air binding of the engine cooling system

B.a cracked water cooled exhaust manifold

C.blockage in the heat exchanger

D.faulty operation of the thermostat

请帮忙给出正确答案和分析,谢谢!

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