题目内容：
防水混凝土施工期间应将地下水位降至防水工程底板垫层（ ）以下。
A．200mm B．300mm
C．500mm
D．600mm
参考答案：
答案解析：
单选题：防水混凝土施工期间应将地下水位降至防水工程底板垫层（ ）以下。
- 题目分类：矿业工程
- 题目类型：单选题
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B．300mm
C．500mm
D．600mm
B．300mm
C．500mm
D．600mm
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