我国饮用水水质卫生标准规定,饮用水中的硬度(以CaC03计)不得超过A.150mg/LB.300mg/LC.450mg/LD.500mg/L ...

作者: rantiku 人气: - 评论: 0
问题 我国饮用水水质卫生标准规定,饮用水中的硬度(以CaC03计)不得超过
选项 A.150mg/L B.300mg/L C.450mg/L D.500mg/L E.600mg/L
答案 C
解析

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