23.如右图是打秋千的示意图.最初人直立站在踏板上a点所示绳与竖直方�成θ角人的重心到悬点o的距离为l1从a点�最低点b运动过程中 Template




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tomski23.如右图是打秋千的示意图.最初人直立站在踏板上a点所示绳与竖直方�成θ角人的重心到悬点o的距离为l1从a点�最低点b运动过程中 coloring