题目内容：
护栏按其刚度的不同可分为（ ）。
A．柔性护栏 B．刚性护栏
C．半刚性护栏
D．钢筋混凝土护栏
E．波形梁护栏
参考答案：
答案解析：
多选题：护栏按其刚度的不同可分为（ ）。
- 题目分类：公路工程
- 题目类型：多选题
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B．刚性护栏
C．半刚性护栏
D．钢筋混凝土护栏
E．波形梁护栏
B．刚性护栏
C．半刚性护栏
D．钢筋混凝土护栏
E．波形梁护栏
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