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