A . 0.5ppm
B . 0.7~1ppm
C . 1.0~1.5ppm
D . 2.0ppm
E . 以上均不是
[单选题]饮用水适宜的氟浓度一般为A.0.5ppmB.0.7~1ppmC.1.0~1.5ppmD.2.0ppmE.以上均不是
[单选题]饮用水适宜的氟浓度一般为( )。A.0.5ppmB.0.7~1ppmC.1.0~1.5ppmD.2.0ppmE.以上均不是
[单选题]饮用水中含氟的适宜浓度为()A .小于0.2mg/lB .小于0.5mg/lC .0.5-1.0mg/lD .大于1.0mg/l
[单选题]饮用水的适宜氟浓度是()A.1.0~1.2mg/LB.0.7~1.0mg/LC.0.5~0.7mg/LD.0.3~0.5mg/LE.<0.3mg/L
[单选题]生活饮用水的pH一般为A.6.5~7.0B.7C.6.5~0.5D.7.2~8.5E.8.0~9.0
[单选题]生活饮用水的pH一般为A.6.5~7.0B.6.5~8.5C.8.0~9.0D.7.OE.7.2~8.5
[单选题]生活饮用水的pH一般为A.6.5~7.0B.7C.6.5~8.5D.7.2~8.5E.8.0~9.0
[单选题]生活饮用水的pH一般为A.6.5~7.0B.7C.6.5~0.5D.7.2~8.5E.8.0~9.0
[判断题] 我国规定饮用水中氟浓度应小于1.0毫克/升。A . 正确B . 错误
[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