题目内容：
闸门按结构形式可分为（ ）。
A．平面闸门 B．直升式闸门
C．弧形闸门
D．人字闸门
E．伸缩式闸门
参考答案：
答案解析：
多选题：闸门按结构形式可分为（ ）。
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- 题目类型：多选题
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B．直升式闸门
C．弧形闸门
D．人字闸门
E．伸缩式闸门
B．直升式闸门
C．弧形闸门
D．人字闸门
E．伸缩式闸门
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