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
单项选择题 Which of the following statements is true concerning an oil cooler?（）
单项选择题 One method of constructing large marine diesel engines and reducing the total engine frame weight is through （）.
单项选择题 Prior to lighting off a cold automatically fired auxiliary boiler, you should （）.
