Active transport: This process is characterized by selectivity and saturability and requires energy expenditure by the cell.
主动转运这种转运过程的特征是选择性和饱和性，需要细胞的能量消耗。
The effect of the base saturability, the dosage and the temperature of coagulation of PAC on the grey water of paper industry has been studied.
研究了聚合氯化铝的盐基度、用量及混凝温度对造纸中段水处理效果的影响。
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