A.liquid
B.oily mixture
C.emulsion
D.vapor
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A.liquid
B.gas
C.solid
D.water only
A.balance
B.not balance
C.be more than
D.be less than
A.ice
B.wooden board
C.iron plate
D.cotton waste
A.gas oil
B.diesel oil
C.chemical compound
D.Freon-12
A.the toping light
B.the board brake
C.the fail-safe
D.the barrel shaft
最新試題
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
A salinity indicator is used to determine the （）.
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
Thermostatic expansion valves can be adjusted for （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
Low compressor head pressure in a refrigeration system can be caused by（）.
Which of the listed pumps is NOT a positive displacement pump?（）
A salinity indicator is used to determine the （）.