在图9中,用一个动�轮和两个定�轮组成的�轮组提升重物a,要求作用在绳自由端的拉力方��下,有三段绳子承担物重,请在图中画出绳的绕法。——青夏 Template




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tomski在图9中,用一个动�轮和两个定�轮组成的�轮组提升重物a,要求作用在绳自由端的拉力方��下,有三段绳子承担物重,请在图中画出绳的绕法。——青夏 coloring