A.rise
B.fall
C.be maintained constant
D.None of the above is true
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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
A.liquid receiver
B.compressor
C.condenser
D.cooling coil
A.evaporator
B.condenser
C.expansion valve
D.compressor
最新試題
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
A grease gun is generally used to lubricate a （）.
Thermostatic expansion valves can be adjusted for （）.
The rate of heat transfer from a hot region to a cold region is affected most by the （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
A salinity indicator is used to determine the （）.
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.