A . 相同浓度
B . 2.5倍
C . 4.5倍
D . 5.5倍
E . 6.5倍
[单选题]学校饮水氟浓度是公共饮水氟浓度的多少倍A.1.5倍B.2.5倍C.3.5倍D.4.5倍E.5.5倍
[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]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]学校饮水加氟的氟浓度应为自来水氟浓度的()A . 2.5倍B . 3.5倍C . 4.5倍D . 5.5倍E . 6.5倍
[单选题]学校饮水加氟的氟浓度应为自来水氟浓度的()A.2.5倍B.3.5倍C.4.5倍D.5.5倍E.6.5倍
[单选题]某城市饮水氟浓度是0.1mg/L,若将该城市作为饮水氟化预防龋病的试点城市,则:饮水氟化的适宜浓度范围是A.0.3~0.5mg/LB.0.5~0.7m
[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