A、a sewage treatment plant
B、the extended aeration process
C、the liquor
D、the bubbling air
更多“A number of biological sewage treatment plants are in use at sea but nearly all work on what is called the extended aeration processBasically the consists of oxygenating the liquor by bubbling air through itAccording to the above two sentences, the word "this" means （）.”相关的问题
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