A.1.2~1.5mg/L
B.低于0.4mg/L
C.0.7~1.2mg/L
D.0.4~O.7mg/L
E.1.5~2.0mg/L
[单选题]适宜的饮水氟浓度为( )。A.1.2~1.5mg/LB.低于0.4mg/LC.0.7~1.2mg/LD.0.4~O.7mg/LE.1.5~2.0mg
[单选题]适宜的饮水氟浓度为( )。A.1.2~1.5mg/LB.低于0.4mg/LC.0.7~1.2mg/LD.0.4~O.7mg/LE.1.5~2.0mg
[单选题]学校饮水氟化时,饮水氟浓度可以为饮水氟适宜浓度的()A . 相同浓度B . 2.5倍C . 4.5倍D . 5.5倍E . 6.5倍
[单选题]刘大维等认为我国饮水适宜氟浓度为A.B.C.D.E.
[单选题]饮水的适宜氟浓度应控制在()A . 0.5mg/L以下B . 1mg/L以下C . 0.5~0.6mg/LD . 0.5~0.7mg/LE . 0.7~1mg/L
[单选题]饮水的适宜氟浓度一般保持A.0.4~0.7mg/LB.0.5~1.0mg/LC.0.6~0.9mg/LD.0.7~1mg/LE.0.8~1.5mg/L
[单选题]饮水的适宜氟浓度一般保持A.0.4~0.7mg/LB.0.5~1.0mg/LC.0.6~0.9mg/LD.0.7~1mg/LE.0.8~1.5mg/L
[单选题]饮水的适宜氟浓度应控制在()A.0.5mg/L以下B.1mg/L以下C.0.5~0.6mg/LD.0.5~0.7mg/LE.0.7~1mg/L
[单选题]饮水的适宜氟浓度应控制在()A.0.5mg/L以下B.1mg/L以下C.0.5~0.6mg/LD.0.5~0.7mg/LE.0.7~1mg/L
[单选题]饮水的适宜氟浓度应控制在( )。A.0.5mg/L以下B.1mg/L以下C.0.5~0.6mg/LD.0.5~0.7mg/LE.0.7~1mg/L