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笔者通过5种解法,对2017年理综全国Ⅰ卷第21题进行了剖析,尝试进行较为全面的解答,希望能在教育教学上和大家共同提高.
Through five kinds of solutions, the author analyzes the 21st National Science Volume Ⅰ Volume 21 in 2017 and tries to make a more comprehensive answer, hoping to improve together with others in education and teaching.