A.filter
B.hole
C.pollution
D.content
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A.scaled
B.worn
C.deformed
D.rested
A.a heater
B.a pre-heater
C.an exhaust gas boiler
D.the coal burning boiler
A.be increased
B.be decreased
C.remain constant
D.either be increased or remain constant
A.the more
B.the higher
C.the lower
D.the highest
A.monkey
B.donkey
C.waste heat
D.main
最新試題
The general purpose of a heat exchanger is to （）.
The rate of heat transfer from a hot region to a cold region is affected most by the （）.
The usual symptoms of cavitation in a centrifugal pump is （）.
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
A salinity indicator is used to determine the （）.
A pressure drop through the refrigerant liquid line may cause （）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.