题目内容：
根据《公路工程施工安全技术规程》规定，人工挖孔桩允许的最大深度为（ ）m。
A．10 B．15
C．18
D．20
参考答案：
答案解析：
单选题：根据《公路工程施工安全技术规程》规定，人工挖孔桩允许的最大深度为（ ）m。
- 题目分类：公路工程
- 题目类型：单选题
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B．15
C．18
D．20
B．15
C．18
D．20
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