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某地下车库出口处安装了“两段式栏杆”,如图1所示,点A是栏杆转动的支点,点E是栏杆:两段的联结点.当车辆经过时,栏杆AEF最多只能升起到如图2所示的位置,其示意图如图3所示(栏杆宽度忽略不计,EF长...
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