20.如图所示两个完全相同的光�球的质量均为m放在竖直挡板和倾角为α的固定斜面间.若缓慢转动挡板至与斜面垂直在此过程中 A.ab两球间 Template




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tomski20.如图所示两个完全相同的光�球的质量均为m放在竖直挡板和倾角为α的固定斜面间.若缓慢转动挡板至与斜面垂直在此过程中 a.ab两球间 coloring