用跨过定�轮的绳把湖中小船拉靠岸 如图 所示已知拉绳的速度v不变 则船速 A不变 B逐渐增大 C逐渐减小 D先增大后减小 Template




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tomski用跨过定�轮的绳把湖中小船拉靠岸 如图 所示已知拉绳的速度v不变 coloring