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干电池的电动势是否随新旧程度的不同而发生变化?通过对一道习题的讨论,进行逆向思维,设计并进行实验,对这一问题给出了明确的结论。
Whether the electromotive force of the dry cell changes with the newness or not? Through a discussion of exercises, reverse thinking, design and experiment, this issue is given a clear conclusion.