【单选题】【消耗次数：1】
楼梯由（）、（）和（）三部分组成。
①
梯段、平台、栏杆扶手
②
梯段、栏杆、扶手
③
梯段、平台、缓冲部分
④
梯段、平台、缓冲部分
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楼梯主要由梯段；[填空(1)]和[填空(2)]三部分组成
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