题目内容：
涵洞是多孔跨径的全长不到（ ）和单孔跨径不到5m的结构物。
A．15m B．12m
C．10m
D．8m
参考答案：
答案解析：
单选题：涵洞是多孔跨径的全长不到（ ）和单孔跨径不到5m的结构物。
- 题目分类：公路工程管理与实务
- 题目类型：单选题
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B．12m
C．10m
D．8m
B．12m
C．10m
D．8m
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