问题
单项选择题 A1型题
水氟浓度在多少时,患龋率和龋均最低,氟牙症发生率也较低()
A.0.2~0.4mg/L
B.0.4~0.6mg/L
C.0.6~0.8mg/L
D.0.8~1.0mg/L
E.1.0~1.2mg/L
答案
参考答案:C
水氟浓度在多少时,患龋率和龋均最低,氟牙症发生率也较低()
A.0.2~0.4mg/L
B.0.4~0.6mg/L
C.0.6~0.8mg/L
D.0.8~1.0mg/L
E.1.0~1.2mg/L
参考答案:C