如图所示的�轮组可忽略绳重和�擦.用弹簧测力计竖直�上匀速拉动绳端将重为6n的物体提升20cm弹簧测力计的示数如图所示则拉力做的功为1 Template




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tomski如图所示的�轮组可忽略绳重和�擦.用弹簧测力计竖直�上匀速拉动绳端将重为6n的物体提升20cm弹簧测力计的示数如图所示则拉力做的功为1 coloring