單項(xiàng)選擇題The bilge main is arranged to drain any watertight compartment （） ballast, oil or water tanks and to discharge the contents overboard.

A.rather than
B.other than
C.in addition that
D.except for


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1.單項(xiàng)選擇題Oil water separators are used to ensure that ships dont discharge oil when pumping out （）.

A.ballast water
B.boiler water
C.bilge water
D.sewage water

2.單項(xiàng)選擇題（）are used to ensure that ships don’t discharge oil when pumping out oily water from any oil contaminated space.

A.Boiler
B.Incinerator
C.Oily water separator
D.Sewage treatment unit

3.單項(xiàng)選擇題High-speed rotation in a centrifugal purifier can produce a force （） the force of gravity.

A.many thousand times larger than
B.the same as
C.many thousand times smaller
D.none of the above

4.單項(xiàng)選擇題The separation of impurities and water from （） is essential for good combustion of diesel engines.

A.lube oil
B.fuel oil
C.turbine oil
D.grease

5.單項(xiàng)選擇題

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）