单项选择题

若两种酸HX和HY的水溶液具有相同的pH值,则这两种酸的浓度相等。 A. 对 B. 错

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单项选择题

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单项选择题

-We should not only study all the time.
-We should go out and practice.

A.We should only study all the time in opposition to going out and practice.
B.We should go out and practice as opposed to only studying all the time.