A.center
B.periphery
C.inlet
D.upper parts
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A.an oily water separator
B.a purifier
C.a centrifugal compressor
D.a clarifier
A.an oily water separator
B.a purifier
C.a centrifugal compressor
D.a clarifier
A.air
B.black oil
C.water
D.ice cream
A.rather than
B.other than
C.in addition that
D.except for
A.ballast water
B.boiler water
C.bilge water
D.sewage water
A.Boiler
B.Incinerator
C.Oily water separator
D.Sewage treatment unit
A.many thousand times larger than
B.the same as
C.many thousand times smaller
D.none of the above
A.lube oil
B.fuel oil
C.turbine oil
D.grease
Which of the following may hardness of the boiler water cause?()
(1) scale formation
(2) tube failure
(3) corrosion
A.(1)and(2)
B.(1)and(3)
C.(2)and(3)
D.(1),(2)and(3)
A.higher than the actual drum water level
B.equal to the actual drum water level
C.increasing due to steam condensation in the glass
D.lower than actual drum water level
最新试题
A salinity indicator is used to determine the ().
Which of the following statements is correct concerning heat transfer?()
If the head pressure of a reciprocating refrigeration compressor is excessive, ().
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will ().
A pressure drop through the refrigerant liquid line may cause ().
The usual symptoms of cavitation in a centrifugal pump is ().
Low compressor head pressure in a refrigeration system can be caused by().
The major source of chemical contaminants in hydraulic fluid is ().
When the steering gear is in operation, you should ().
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of ().