题目内容：
当路堑表层冻土厚度大于1m时，宜采用的开挖方法是（ ）。
A．爆破冻土法 B．机械破冻法
C．热水开冻法
D．蒸汽放热解冻法
参考答案：
答案解析：
单选题：当路堑表层冻土厚度大于1m时，宜采用的开挖方法是（ ）。
- 题目分类：公路工程
- 题目类型：单选题
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B．机械破冻法
C．热水开冻法
D．蒸汽放热解冻法
B．机械破冻法
C．热水开冻法
D．蒸汽放热解冻法
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