能引起慢性氟中毒的氟浓度是A、<0.3ppmB、0.4~0.6ppmC、0.7~1.0ppmD、1.5ppmE、2~4ppm
能引起慢性氟中毒的氟浓度是
A、<0.3ppmB、0.4~0.6ppmC、0.7~1.0ppmD、1.5ppmE、2~4ppm
相关考题:
可引起氟牙症流行的氟浓度是A、<0.2ppmB、0.6~0.8ppmC、1.0ppmD、2~4ppmE、4~10ppm
能引起慢性氟中毒的氟浓度是
A、<0.3ppmB、0.4~0.6ppmC、0.7~1.0ppmD、1.5ppmE、2~4ppm