单项选择题

The extended aeration process consists of （） the liquor either by bubbling air through it or by agitating the surface.

A.deoxygenating
B.oxygenating
C.chemicalizing
D.disinfecting

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单项选择题

A number of biological sewage treatments plants are in use at sea but nearly all work on the principle called （）

A.deoxygenating
B.extended aeration
C.oxygenating
D.bubbling air

单项选择题

Which of the following would not be burnt in an incinerator on board?（）

A.waste oil
B.waste cloths
C.Oil rags
D.Waste food

单项选择题

During waste clothes being charged into an incinerator, the auxiliary burner（）.

A.should be stopped manually
B.keeps the combustion as usual
C.would be cut off by an interlock
D.would replace the waste oil burner and keep going on