英语词典
With the prolonging of the operation, the activities of anaerobic and aerobic sludge recovered gradually and the time for activity recovery was directly proportional to the ratio of industrial wastewater in influent.
随着运行时间的延长,两类污泥的活性逐步得到不同程度的恢复;工业废水比例越高,活性恢复所需时间越长;
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