A.fresh water
B.fresh air
C.salt water
D.artificial respiration
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A.rub the eyes
B.irritate the eyes
C.wash the eyes with a heavy boric acid solution
D.obtain medical help
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
最新試題
Low compressor head pressure in a refrigeration system can be caused by（）.
The general purpose of a heat exchanger is to （）.
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will （）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
A pressure drop through the refrigerant liquid line may cause （）.
Which of the listed pumps is NOT a positive displacement pump?（）
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.