题目内容：
地下水位以下挖土时，应将地下水降至槽底以下（ ）mm。
A．50 B．100
C．300
D．500
参考答案：
答案解析：
单选题：地下水位以下挖土时，应将地下水降至槽底以下（ ）mm。
- 题目分类：矿业工程
- 题目类型：单选题
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B．100
C．300
D．500
B．100
C．300
D．500
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