A.rub the eyes
B.irritate the eyes
C.wash the eyes with a heavy boric acid solution
D.obtain medical help
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A.Refrigeration
B.Air conditioning
C.Ventilation
D.Heating
A.Refrigeration
B.Air conditioning
C.Ventilation
D.Heating
A.increase；reduce
B.reduce；increase
C.increase；increase
D.reduce；reduce
A.instantaneous
B.instantaneously
C.simultaneous
D.simultaneously
A.An economizer
B.An attemperator
C.A water dram
D.A down-comer tube
最新試題
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
A pressure drop through the refrigerant liquid line may cause （）.
Low compressor head pressure in a refrigeration system can be caused by（）.
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should （）.
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will （）.