By pre aeration in tanyard wastewater, the effect of primary settling improves obviously.
制革污水采用预曝气处理后，可大大提高初沉池沉淀效
。
By pre aeration in tanyard wastewater, the effect of primary settling improves obviously.
制革污水采用预曝气处理后，可大大提高初沉池沉淀效。
：以上例句、词性分类均
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