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單項選擇題

Which of the following statements describes the functions of a reservoir used in a hydraulic system?（）

A.Dissipate heat
B.Trap foreign matter
C.Separate air from the oil
D.All of the above

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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

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

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