A.expand
B.evaporate
C.condense
D.distil
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A.little
B.few
C.a little
D.a few
A.liquid
B.oily mixture
C.emulsion
D.vapor
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
最新試題
The rate of heat transfer from a hot region to a cold region is affected most by the （）.
When the steering gear is in operation, you should （）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
Low compressor head pressure in a refrigeration system can be caused by（）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
Thermostatic expansion valves can be adjusted for （）.
The major source of chemical contaminants in hydraulic fluid is （）.
Which of the listed pumps is NOT a positive displacement pump?（）