A.evaporation
B.frosting
C.condensing
D.compressing
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A.rise
B.fall
C.be maintained constant
D.None of the above
A.rise
B.fall
C.be maintained constant
D.None of the above is true
A.raised
B.risen
C.reduced
D.maintained constant
A.humidity
B.dry
C.steam
D.oil
A.condenser
B.regurgitate
C.evaporator
D.boil coil
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A grease gun is generally used to lubricate a （）.
A salinity indicator is used to determine the （）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
A pressure drop through the refrigerant liquid line may cause （）.
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will （）.
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.