我国饮用水标准含氟量是A.0.1ppm B.0.5ppm C.0.5-1.0ppm D.1.5ppm E.2.0ppm

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问题我国饮用水标准含氟量是

选项 A.0.1ppm
B.0.5ppm
C.0.5-1.0ppm
D.1.5ppm
E.2.0ppm

答案C

解析

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