单项选择题
A.Dissipate heat B.Trap foreign matter C.Separate air from the oil D.All of the above
Which of the problems listed could be indicated if a si...
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
Moisture in a refrigeration system can cause （）.A.freez...
单项选择题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
When the propeller blades are integral with the hub, th...
单项选择题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
