单选题:上下导坑先拱后墙法的最大优点是(  )。

题目内容:
上下导坑先拱后墙法的最大优点是(  )。 A.施工快捷
B.施工安全
C.施工工序少
D.便于使用大型机具
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答案解析:

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The coral island nations of the Pacific have a long history of civilization.A.Ri

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Rescue vehicles had a hard time getting to people.

Rescue vehicles had a hard time getting to people.A.Right B.Wrong C.Not mentione

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涵洞按建筑材料可分为砖涵、石涵、混凝土涵和(  )。

涵洞按建筑材料可分为砖涵、石涵、混凝土涵和(  )。 A.砖石涵 B.板涵 C.钢筋混凝土涵 D.土涵

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