单项选择题
In a shell-and-tube type hydraulic fluid cooler, the amount of heat transferred from the hydraulic fluid to the cooling water depends upon（）
A.the temperature of the hydraulic fluid B.the flow rate of the hydraulic fluid C.the temperature of the cooling water D.all of the above
单项选择题 An orifice-check valve placed in a hydraulic system is used to（）
单项选择题 Purging air from a hydraulic system is necessary when（）
单项选择题 Leakage of hydraulic fluid from around the shaft of a hydraulic motor may be caused by（）
