If the jacket water temperature in an auxiliary diesel engine cooling system is lower than normal, the probable cause is （）<br>A:air binding of the engine cooling system<br>B:a cracked water cooled exhaust manifold<br>C:blockage in the heat exchanger<br>D:faulty operation of the thermostat

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

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