单项选择题
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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单项选择题
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 -
单项选择题
（）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 -
单项选择题
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
