A.air
B.black oil
C.water
D.ice cream
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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
最新試題
Low compressor head pressure in a refrigeration system can be caused by（）.
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
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 （）.
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
When the steering gear is in operation, you should （）.
A grease gun is generally used to lubricate a （）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
One cause of high head pressure occurring in a refrigeration system can be （）.