氟化自来水的适宜浓度为A.0.5mg/L B.1.5mg/L C.0.7~1

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问题 氟化自来水的适宜浓度为A.0.5mg/LB.1.5mg/LC.0.7~1.0mg/LD.0.05~0.07mg/LE.0.04-0.06mg/L

选项 A.0.5mg/L
B.1.5mg/L
C.0.7~1.0mg/L
D.0.05~0.07mg/L
E.0.04-0.06mg/L

答案 C

解析
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