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【简答题】
大型广告牌靠两根下端固定的立柱支承，尺寸如图。广告牌的重量为980N/m2，承受的最大风压为600Pa。立柱为α=0.8的空心圆柱，许用应力[σ]=160MPa。不计立柱和固定装置重量，试选择立柱外径。
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参考解析：
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