【单选题】
Of a kind of liquid is used to cool the diesel engine, it is invariably called （）
A、lubricant
B、coolant
C、combustion product
D、second refrigerant
查看正确答案
A、centerline of the pump and the level of the liquid in the suction well when the source of liquid is below the pump B、centerline of the pump and the suction liquid level when the source of liquid is above the pump C、centerline of the pump and the level of the discharge liquid D、liquid levels of the suction and discharge
