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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Thermostatic expansion valves can be adjusted for （）.
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The usual symptoms of cavitation in a centrifugal pump is （）.
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.
The major source of chemical contaminants in hydraulic fluid is （）.
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.
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The general purpose of a heat exchanger is to （）.
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）