饮水加氟的适宜浓度是 A.0.3~0.5mg/L B.0.5~0.7mg/l C.0.7~1.0mg/L D.1.0~1.2mg/L E.1.2~1.5mg/L

admin2012-02-25  30

问题 饮水加氟的适宜浓度是
A.0.3~0.5mg/L
B.0.5~0.7mg/l
C.0.7~1.0mg/L
D.1.0~1.2mg/L
E.1.2~1.5mg/L

选项 A、 
B、 
C、 
D、 
E、 

答案C

解析
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