A.a needle gun
B.soap and water
C.a wire brush
D.a chipping hammer
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A.Hydrochloric acid
B.Chlorine
C.Sulfuric acid
D.Zinc chromate
A.absolute humidity
B.relative humidity
C.specific humidity
D.total humidity
A.excessive pump speed
B.excessive suction head
C.worn wearing rings
D.gross pump misalignment
A.Distillation is the process of boiling seawater to produce vapor which is condensed into fresh water
B.Evaporation is the second part of the distillation process where brine is removed
C.Brine is the result of condensed sea water vapor
D.Distillate is the product resulting from the evaporation of fresh water vapor
A.absolute humidity
B.specific humidity
C.effective humidity
D.relative humidity
A.drain water from the air receiver
B.drain water from the cylinders
C.delay the compression process until the motor is up to speed
D.check pump alignment
A.face shield
B.a respirator
C.rubber gloves
D.an all purpose gas mask
A.lantern rings
B.bearings
C.easing volutes
D.wearing rings
A.packing gland
B.mechanical seals
C.lantern rings
D.wearing rings
A.through a detachable hose connection
B.after passing through an activated charcoal filter
C.after chemical analysis shows it is fit for consumption
D.through a solenoid operated three-way valve
最新试题
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by ().
The usual symptoms of cavitation in a centrifugal pump is ().
Thermostatic expansion valves can be adjusted for ().
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?()
One cause of high head pressure occurring in a refrigeration system can be ().
The general purpose of a heat exchanger is to ().
An excessive charge of refrigerant in an air-cooled refrigeration system can cause ().
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 ().
Which of the listed pumps is NOT a positive displacement pump?()
The control mode in which the final control element is moved from one of two flexed positions to the other is known as ().