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

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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

单项选择题

The solid waste was charged into the incinerator through （）.

A.the solid waste dump chute
B.an access door
C.the same way for waste oil burners
D.a changing opening