單項(xiàng)選擇題

If a refrigeration system compressor crankcase is sweating, you should （）.

A.add refrigerant to the system
B.adjust the thermal expansion valve to the proper setting
C.adjust the float valve to the proper holding pressure
D.open the hand expansion valve

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單項(xiàng)選擇題

Crankcase sweating in a refrigeration system is caused by （）.

A.a stuck solenoid valve
B.a shortage of refrigerant
C.too much oil in circulation
D.too much superheat

單項(xiàng)選擇題

In an electro-hydraulic steering system, under movement is maintained in close synchronization with the steering wheel position by means of the （）.

A.trick-wheel
B.follow-up control
C.six-way valve
D.Rapson slide