(来学网)适宜的饮水氟浓度为()。
  • A.
    (来学网)1.2~1.5mg/L
  • B.
    (来学网)低于0.4mg/L
  • C.
    (来学网)0.7~1.0mg/L
  • D.
    (来学网)0.4~0.7mg/L
  • E.
    (来学网)1.5~2.0mg/L
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