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中学物理习题中涉及到斜面的问题较多，物体在斜面上运动的情况常因外界条件不同而有所变化。这里仅就常遇到的一些情况作些分析。
There are many problems involving slopes in the middle school physics exercises. The movement of objects on the slopes often changes due to different external conditions. Here only some of the frequently encountered situations are analyzed.