A.more economicB.larger capacity on oil treatmentC.less……

单项选择题Which of the following methods might be used as the treatment on emulsified oil?（）

A.gravity separation
B.centrifuge
C.Cyclone
D.Cross-flow membrane filtration

单项选择题When discharging bilge water, which criteria must be observed?（）

A.The requirement for the oil content of bilge water discharged is 15 ppm
B.No discharge in sensitive waters
C.Any discharge in sensitive waters
D.International, national or local requirements have to be observed

单项选择题When bilge water is heated in a holding tank, which one of the following statements is not accurate?（）

A.The high temperature facilitates primary gravity separation
B.Most of the oil and organic solvents are raised to the top layer
C.The high the temperature is, the more the top oil will be collected
D.The high temperature has little use on the separation of emulsified oil

单项选择题Which one of the following is not generally recognized as one constitute of bilge water?（）

A.Oil leaking from tanks inside engine room
B.Engine room cleaning water
C.Water leaking from the separator sludge tank
D.Sewage

单项选择题A centrifugal compressor’s purge recovery unit（）

A.reclaims water
B.purges air without losing refrigerant
C.purges air with some loss of refrigerant
D.purges lube oil from the refrigerant