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题目内容 (请给出正确答案)
单选题
适宜的饮水氟浓度为(  )。
A

1.2~1.5 mg/L

B

低于0.4mg/L

C

0.7~1.2 mg/L

D

0.4~O.7 mg/L

E

1.5~2.0 mg/L


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