16.如图所示的�轮组匀速拉起重3牛的物体若不考�动�轮和绳重及�擦绳自由端的拉力为 牛若绳端的实际拉力为2牛物体在4秒内被匀速提高0 Template




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tomski16.如图所示的�轮组匀速拉起重3牛的物体若不考�动�轮和绳重及�擦绳自由端的拉力为 牛若绳端的实际拉力为2牛物体在4秒内被匀速提高0 coloring