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【单选题】
涵洞沿洞身长度方向应分段设置沉降缝,以防不均匀沉降而引起洞身断裂。每隔( )设一道。A.
大于2～3m
B.
5m
C.
4～6m
D.
7～8m
E.
的拱圈常采用( )。
F.
等厚的圆弧拱
G.
等厚的悬链线拱
H.
等厚的抛物线拱
I.
变厚的圆弧拱
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A.
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B.
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C.
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D.
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