(来学网)饮水的适宜氟浓度应控制在
  • A.
    (来学网)0.5mg/L以下
  • B.
    (来学网)1mg/L以下
  • C.
    (来学网)0.5~0.6mg/L
  • D.
    (来学网)0.5~0.7mg/L
  • E.
    (来学网)0.7~1mg/L
正确答案:
B