引起氟牙症的水源中含氟浓度是 ( )A.超过0.2ppm,小于0.5ppmB.超

考试题库2022-08-02  59

问题 引起氟牙症的水源中含氟浓度是 ( )A.超过0.2ppm,小于0.5ppmB.超过0.1ppm,小于0.5ppmC.低于1ppm,超过0.5ppmD.超过2ppmE.超过1ppm,小于2.0ppm

选项 A.超过0.2ppm,小于0.5ppmB.超过0.1ppm,小于0.5ppmC.低于1ppm,超过0.5ppmD.超过2ppmE.超过1ppm,小于2.0ppm

答案 D

解析
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