A.symptoms
B.samples
C.traces
D.tracks
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A.expand
B.evaporate
C.condense
D.distil
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
最新試題
The usual symptoms of cavitation in a centrifugal pump is （）.
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
Which of the following statements is correct concerning heat transfer?（）
Thermostatic expansion valves can be adjusted for （）.
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
Low compressor head pressure in a refrigeration system can be caused by（）.