單項選擇題

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

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單項選擇題

（）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

單項選擇題

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