(来学网)我国饮用水标准含氟量是
  • A.
    (来学网)0.1ppm
  • B.
    (来学网)0.5ppm
  • C.
    (来学网)0.5~1.0ppm
  • D.
    (来学网)1.0~1.5ppm
  • E.
    (来学网)1.0ppm