饮水氟化预防龋病的适宜浓度是
A、0.1~0.3mg/L
B、0.4~0.6mg/L
C、0.7~1.0mg/L
D、1.1~1.3mg/L
E、1.4~1.6mg/L
第1题:
在进行人工饮水加氟时适宜的氟浓度一般应保持在
A.0.3~0.6mg/L
B.0.7~1.0mg/L
C.1.1~1.4mg/L
D.1.5~1.8mg/L
E.1.9~2.2mg/L
第2题:
饮水氟化预防龋病的适宜氟浓度是
A.0.1~0.3mg/L
B.0.4~0.6mg/L
C.0.7~1.0mg/L
D.1.1~1.3mg/L
E.1.4~1.6mg/L
第3题:
第4题:
饮水氟化预防龋病的适宜氟浓度是
A.0.1~0.3mg/L
B.0.4~0.6mg/L
C.0.7~1.0mg/L
D.1.1~1.3mg/L
E.1.4~1.6mg/L
第5题: