单项选择题

Which of the valves listed is NOT considered to be a hydraulic system directional control valve?（）

A.Spring-centered valve
B.Unloading valve
C.Three-position valve
D.Two-position valve

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单项选择题

Which of the listed refrigeration system components keeps the refrigerant circulating through the system?（）

A.Expansion valve
B.Condenser
C.Evaporator
D.Compressor

单项选择题

Which of the listed components is considered to separate the high pressure side of a refrigeration cycle from the low pressure side of the cycle?（）

A.The condenser and the expansion valve
B.The king valve and the solenoid valve
C.The compressor and the expansion valve
D.The condenser and the solenoid valve