单项选择题
The basic process of biological sewage treatment consists of the liquor either by bubbling air through it or by agitating the surface（）
A.oxygenating
B.oxidizing
C.deoxygenating
D.proportioning
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When the garbage is mixed with some discharges having different disposal or discharge requirements, shall apply（）
A.any requirement appointed by the Officer
B.the most suitable requirement
C.the most stringent requirement
D.no requirement -
单项选择题
Disposal of all kinds of garbage but is prohibited within Special Areas（）
A.plastics
B.comminuted or ground papers, rags, glass, metal etc
C.food waste comminuted or ground
D.Incinerator ash -
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Which of the following methods can not remove the non-separable emulsified oil in bilge water?（）
A.gravity separation
B.use of adsorbents
C.use of flocculents
D.use of chemical addition
