如图所示b物体重20na为动�轮绳子一端固定在地上当�轮a在力f的作用下以05ms的速度匀速上升则物体b的速度是 A.0 Template




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tomski如图所示b物体重20na为动�轮绳子一端固定在地上当�轮a在力f的作用下以05ms的速度匀速上升则物体b的速度是 a.0 coloring