(来学网)饮水中适宜的氟含量为
  • A.
    (来学网)大于1.0MG/L
  • B.
    (来学网)0.5~1.0MG/L
  • C.
    (来学网)小于0.5MG/L
  • D.
    (来学网)大于0.03MG/L
  • E.
    (来学网)大于1.5MG/L