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單項選擇題

Which of the problems listed could be indicated if a sight glass in the refrigerant liquid line is full of bubbles?（）

A.Proper refrigerant charge
B.Faulty expansion valve
C.Insufficient refrigerant
D.Solenoid valve stuck open

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單項選擇題

Moisture in a refrigeration system can cause （）.

A.freezing the expansion valve closed
B.corrosion of system piping
C.improper temperature regulation
D.all of the above

單項選擇題

When the propeller blades are integral with the hub, the propeller is called a （）.

A.built up propeller
B.solid propeller
C.controllable pitch propeller
D.suction back propeller

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