单项选择题
Which of the equipment listed is most effective in processing bilge slops for overboard discharge?（）
A.100PPM oily water separator
B.Assembling the lube oil purifier as a separator and aligning bilge overboard
C.A 15PPM oily water separator
D.A magnetic duplex strainer
单项选择题 If you heard a ‘crackling’ noise in centrifugal pump, the most probable cause of the problem would be（）
单项选择题 The valve which is most suited for regulating the flow through a pipeline is a （）
单项选择题 Increasing the speed of a centrifugal pump will result in an increase in its capacity in its capacityAnother means of increasing the capacity pump is to increase the（）