题目内容：
隧道洞口受坍方、落石、泥石流、滑坡、雪害等危害时，通常应设置（ ）。
A．明洞 B．挡土墙
C．排水沟
D．仰拱
参考答案：
答案解析：
单选题：隧道洞口受坍方、落石、泥石流、滑坡、雪害等危害时，通常应设置（ ）。
- 题目分类：公路工程
- 题目类型：单选题
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B．挡土墙
C．排水沟
D．仰拱
B．挡土墙
C．排水沟
D．仰拱
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