如图所示当物体b重4n时物体a恰能沿水平桌面�右匀速运动.欲使物体a沿桌面�左匀速运动需对a施加水平�左的拉力88n.——青夏教育精英家教�—— Template




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tomski如图所示当物体b重4n时物体a恰能沿水平桌面�右匀速运动.欲使物体a沿桌面�左匀速运动需对a施加水平�左的拉力88n.——青夏教育精英家教�—— coloring