单项选择题
A three-way thermostatic control valve regulates the diesel engine cooling water temperature by passing a portion of the water （）.
A.around the engine B.around the cooler C.to the expansion tank D.overboard
单项选择题 The concentration of total dissolved solids in the water of an auxiliary boiler can increase as a result of （）.
单项选择题 The water in an auxiliary boiler should be tested for chloride content to determine （）.
单项选择题 Cooling the intake air supplied to a diesel engine will （）.
