• 2021-04-14
    有人认为我国饮水适宜氟浓度为A.()饮水氟浓度0.3~0.5ppm()B.()饮水氟浓度0.5ppm()C.()饮水氟浓度0.5~0.8ppm()D.()饮水氟浓度1ppm()E.()饮水氟浓度1~1.2ppm