全身用氟预防龋齿研讨会上,专业人员就各种措施和方法进行探讨,而后讨论的是学校饮水加氟学校饮水加氟的氟浓度应为饮水加氟的A.2.5倍B.3.5倍...

作者: rantiku 人气: - 评论: 0
问题 全身用氟预防龋齿研讨会上,专业人员就各种措施和方法进行探讨,而后讨论的是学校饮水加氟 学校饮水加氟的氟浓度应为饮水加氟的
选项 A.2.5倍 B.3.5倍 C.4.5倍 D.5.5倍 E.6.5倍
答案 C
解析

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