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 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 ().
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should ().
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by ().
The control mode in which the final control element is moved from one of two flexed positions to the other is known as ().
Which of the following statements is correct concerning heat transfer?()
Thermostatic expansion valves can be adjusted for ().
If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should ().
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be ().
The major source of chemical contaminants in hydraulic fluid is ().