单项选择题
The device allowing for the change in volume of the cooling water in a propulsion diesel engine closed cooling system is the （）.
A.fresh water expansion tank
B.sea water expansion tank
C.thermostatic expansion valve
D.jacket water cooler accumulator
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Which of the following statements is true concerning an oil cooler?（）
A.The oil temperature is less than the cooling water temperature
B.The oil pressure is less than the cooling water pressure
C.The oil pressure is greater than the cooling water pressure
D.The oil flow control valve is always installed in the oil input line -
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One method of constructing large marine diesel engines and reducing the total engine frame weight is through （）.
A.casting interlocking components
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Prior to lighting off a cold automatically fired auxiliary boiler, you should （）.
A.check and regulate the water level
B.close the air cock once fires are lit
C.blowdown the gage glass
D.crack the steam stop to assure protective steam flow
