【名词&注释】
可摘局部义齿(removable partial denture)、舌系带矫正术(surgical correction of lingual frenum)、连接区(junctional area)
[单选题]正常情况下,唾液中氟的浓度为
A. 0.005mmol/L B. 0.01mmol/L C. 0.015mmol/L D. 0.02mmol/L E. 0.05mmol/L