如图甲为工人师傅用�轮组提升重物的装置示意图,已知动�轮和水桶总重20n,将重为160n的水以02ms的速度匀速提起,所用时间为20s,此 Template


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tomski如图甲为工人师傅用�轮组提升重物的装置示意图,已知动�轮和水桶总重20n,将重为160n的水以02ms的速度匀速提起,所用时间为20s,此 coloring