单项选择题

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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单项选择题

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

单项选择题

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

单项选择题

A.ignition temperature
B.flash point
C.flammable range
D.convection index