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本刊1998年第9期《此处“光滑”不光滑》一文,对九年义务教材(人教版)初中物理第一册P.131 练习第1题作一些讨论.原题如下:
In the article “Smooth” is not smooth here in the 9th issue of 1998, some discussion is made on the first issue of P.131 exercise in the first year of the nine-year compulsory teaching material (PEP). The original questions are as follows: