A.0.5ppm
B.0.7ppm
C.1.0ppm
D.1.2ppm
E.1.5ppm
[单选题]既能有效地防龋又不至于发生氟牙症的水氟浓度是( )。A.0.5ppmB.0.7ppmC.1.0ppmD.1.2ppmE.1.5ppm
[单选题]既能有效地防龋又不只致发生氟牙症的水氟浓度是( )。A.0.5ppmB.0.7ppmC.1.0ppmD.1.2ppmE.1.5ppm
[单选题]既能有效地防龋又不只致发生氟牙症的水氟浓度是( )。A.0.5ppmB.0.7ppmC.1.0ppmD.1.2ppmE.1.5ppm
[单选题]既能有效地防龋又不只致发生氟牙症的水氟浓度是( )。A.0.5ppmB.0.7ppmC.1.0ppmD.1.2ppmE.1.5ppm
[单选题]既能有效地防龋又不只致发生氟牙症的水氟浓度是( )。A.0.5ppmB.0.7ppmC.1.0ppmD.1.2ppmE.1.5ppm
[单选题]既能有效地防龋又不只致发生氟牙症的水氟浓度是( )。A.0.5ppmB.0.7ppmC.1.0ppmD.1.2ppmE.1.5ppm
[单选题]既能有效防龋又不致发生氟牙症的水氟含量是()A . 0.5ppmB . 0.7ppmC . 1ppmD . 1.2ppmE . 1.5ppm
[单选题]水中含氟量以多少为宜,该浓度既能有效防龋,又不致发生氟牙症A.1mg/LB.0.5mg/LC.0.5~1.0mg/LD.1.5mg/LE.2.0mg/L
[单选题]为了预防氟牙症和龋齿,我国水中氟的适宜浓度是A.0.2~0.7ppmB.0.5~1.0ppmC.0.7~1.2ppmD.1.0~1.5ppmE.1.5~2.0ppm
[单选题]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