residual chlorine短语¹⁴⁴⁹⁷²⁺² 基本例句 余氯 The granule active carbon GAC- sand media is superior to sand media and anthracite- sand media, and the backwashing water with residual chlorine will do harm to the operation of the biofiltration. 颗粒活性炭-石英砂双层滤料组合要优于石英砂单层滤料和无烟煤-石英砂双层滤料，加氯水反冲洗不利于生物滤池的运行。 magsci