如图所示绳的一端通过弹簧秤l固定物体a重力是150牛人用力f拉绳使物体a匀速上升不计�轮绳重及�擦f的大小是 牛弹簧秤的示数是 Template




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tomski如图所示绳的一端通过弹簧秤l固定物体a重力是150牛人用力f拉绳使物体a匀速上升不计�轮绳重及�擦f的大小是 牛弹簧秤的示数是 coloring