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
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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 -
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The separation of impurities and water from （） is essential for good combustion of diesel engines.
A.lube oil
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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）
