| 1. | Among the water quality indicators , cfu - 100ml means the number of colony forming units in 100 ml water ; ntu means nephelometric turbidity unit , and for drinking water , 1 mg l 1 ppm one part per million 水质指标单位中, cfu 100ml表示每100毫升水样中菌落形成单位数colony forming unit : ntu为浊度表示单位nephelometric turbidity unit 。对饮用水而言, 1mg l毫克每公升1ppm百万分之一含量。 |