單項選擇題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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1.單項選擇題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

2.單項選擇題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

3.單項選擇題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

4.單項選擇題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

5.單項選擇題If plastic film insulation becomes damaged in air conditioning system, （） may form within the film.

A.evaporation
B.condensation
C.liquefies
D.vaporization