25.如图所示固定在水平桌面上的倾角为α=30˚的光�斜面足够长其底端有一垂直于斜面的挡板质量均为m的ab两球用轻弹簧连接放在斜面上并 Template




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tomski25.如图所示固定在水平桌面上的倾角为α=30˚的光�斜面足够长其底端有一垂直于斜面的挡板质量均为m的ab两球用轻弹簧连接放在斜面上并 coloring