單項選擇題

In sewage treatment, the term maceration refers to the process of （）

A.breaking up solid matter into fine particles
B.precipitating non-decomposed waste in a collection tank
C.chemically adjusting the sewage ph to 7-0
D.eliminating bacterium coli from the sewage

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單項選擇題

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

單項選擇題

If you heard a ‘crackling’ noise in centrifugal pump, the most probable cause of the problem would be（）

A.insufficient speed
B.cavitation
C.excess discharge pressure
D.excessive net positive suction head B