某同学测量�轮组的机械效率时先用弹簧测力计测出物重g按图示组装好器材拉动弹簧测力计使物体匀速上升用刻度尺分别测出物体上升的高度h和绳端 Template




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tomski某同学测量�轮组的机械效率时先用弹簧测力计测出物重g按图示组装好器材拉动弹簧测力计使物体匀速上升用刻度尺分别测出物体上升的高度h和绳端 coloring