我国现行水质标准氟浓度为 ( )A.0.5~1.0ppm B.1.1~2.0ppm C.0.01~0.05ppm D.0.1~0.4ppm E.﹥2pp

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问题 我国现行水质标准氟浓度为  (    )

选项 A.0.5~1.0ppm
B.1.1~2.0ppm
C.0.01~0.05ppm
D.0.1~0.4ppm
E.﹥2ppm

答案A

解析
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