A.a heater
B.a pre-heater
C.an exhaust gas boiler
D.the coal burning boiler
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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
A.fire
B.water wall
C.generating
D.down comer
A.tightened up
B.sealed up
C.opened up
D.unscrewed
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The usual symptoms of cavitation in a centrifugal pump is （）.
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
Thermostatic expansion valves can be adjusted for （）.
The general purpose of a heat exchanger is to （）.
Which of the following statements is correct concerning heat transfer?（）
A salinity indicator is used to determine the （）.
When the steering gear is in operation, you should （）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
The rate of heat transfer from a hot region to a cold region is affected most by the （）.