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研究机械运动时必须选择参考系,中学物理往往都以地面为参考系.但以下几类问题不能以地面为参考系,现归纳如下:
The study of mechanical movement must choose the reference system, middle school physics are often ground for the reference system.But the following types of problems can not be ground for the reference system, are summarized as follows: