问题

The basic process of biological sewage treatment consists of the liquor either by bubbling

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

请帮忙给出正确答案和分析，谢谢！

参考答案

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