The test show that the optimum dosage of the PAC or PFS is about 1.5-2.5g/L,the optimum dosage of the aluminium vitriolic or iron chloride is about 2-3g/L.是什么意思_The test show that the optimum dosage of the PAC or PFS is about 1.5-2.5g/L,the optimum dosage of the aluminium vitriolic or iron chloride is about 2-3g/L.在线翻译_英语_读音_用法_例句