下列说法正确的是 A.研究物体的运动时只能选择静止的物体作为参考系b.若物体在某段吋间内的平均速度等于零则它在这段时间内任一时刻的瞬时 Template




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tomski下列说法正确的是 a.研究物体的运动时只能选择静止的物体作为参考系b.若物体在某段吋间内的平均速度等于零则它在这段时间内任一时刻的瞬时 coloring