单项选择题
The temperature differential occurring between the inlet temperature of the fluid to be cooled and the outlet temperature of the cooling medium in a shell-and-tube heat exchanger is greatest in which of the flow designs listed?（）
A.Cross B.Parallel C.Counter D.Circular
单项选择题 The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
单项选择题 If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
单项选择题 A salinity indicator is used to determine the （）.
