题目内容：
水闸上游构造中，仅起防冲作用的构造是（ ）。
A．铺盖 B．护底
C．翼墙
D．护坡
参考答案：
答案解析：
单选题：水闸上游构造中，仅起防冲作用的构造是（ ）。
- 题目分类：水利水电工程
- 题目类型：单选题
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B．护底
C．翼墙
D．护坡
B．护底
C．翼墙
D．护坡
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