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简答题绘出满足下列条件的单向匝道横断面图:路面3.50m;左硬路肩1.00m;左土路肩0.75m;左路缘带0.50m;右硬路肩2.50(或1.50m)m;右土路肩0.75m;右路缘带0.50m;加宽值a。
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