饮水加氟的氟浓度不得超过A、<0.2ppmB、0.6~0.8ppmC、1.0ppmD、2~4ppmE、4~10ppm
饮水加氟的氟浓度不得超过
A、<0.2ppm
B、0.6~0.8ppm
C、1.0ppm
D、2~4ppm
E、4~10ppm
相关考题:
A.<0.3ppmB.0.6~0.8ppmC.1.0ppm以下D.2~4ppmE.4~10ppm饮水加氟适宜的氟浓度是
饮水加氟的氟浓度不得超过
A、<0.2ppm
B、0.6~0.8ppm
C、1.0ppm
D、2~4ppm
E、4~10ppm