A.symptoms
B.samples
C.traces
D.tracks
您可能感興趣的試卷
你可能感興趣的試題
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
Which of the listed pumps is NOT a positive displacement pump?（）
A pressure drop through the refrigerant liquid line may cause （）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.
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（）.
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.