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单项选择题
A.an oily water separator
B.a purifier
C.a centrifugal compressor
D.a clarifier
单项选择题
A.an oily water separator
B.a purifier
C.a centrifugal compressor
D.a clarifier
单项选择题
A.rather than
B.other than
C.in addition that
D.except for
单项选择题
A.ballast water
B.boiler water
C.bilge water
D.sewage water
单项选择题
A.Boiler
B.Incinerator
C.Oily water separator
D.Sewage treatment unit
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
A.（1）and（2）
B.（1）and（3）
C.（2）and（3）
D.（1），（2）and（3）
单项选择题
A.higher than the actual drum water level
B.equal to the actual drum water level
C.increasing due to steam condensation in the glass
D.lower than actual drum water level
