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圆形涵洞的配筋应是( )。

  • 2024-01-16 22:14:50
  • 桥隧工题库650题

圆形涵洞的配筋应是( )。

A.普通直筋

B.内外两层螺旋筋

C.预应力钢筋

D.不必配筋

正确答案是B

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