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问题某建筑物内一个水平A角形过道如图1所示,两过道的宽度均为3米.有一个水平截面为矩形的设备需要水平移进直角形过道,若该
Question A horizontal A-shaped hallway in a building is shown in Figure 1. Both aisles have a width of 3 meters. A device with a horizontal cross-section needs to move horizontally into a right-angled aisle.