1.我国饮用水标准含氟量是A、0.1ppmB、0.5ppmC、0.5~1.0ppmD、1.5ppmE、2.0ppm
2.我国饮用水标准含氟量是A.0.5~1.0ppm B.2.0ppm C.1.5ppm D.0.5ppm E.0.1ppm
3.我国饮用水标准含氟量是()A、0.0ppmB、0.5ppmC、0.5~1.0ppmD、1.0~1.5ppmE、1.0ppm
4.我国饮用水标准含氟量是( )