题目内容

重金属检查法中,若以硫代乙酰胺做显色剂,溶液最适pH是

A. 3~3.5 B.4~4.5 C.5~5.5 D.6~6.5 E.7~7.5

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29()

A. like
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A. copying
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26()

A. stay
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A. to remove
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