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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单项选择题

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

单项选择题

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

单项选择题

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）