Unverified83% confidenceDecision RuleTime unknown
扶手长度应比楼梯段起止各延伸至少300mm，使人在踏上第一级前和踏出最后一级后仍有抓握点，仅覆盖楼梯本身长度的扶手存在起步和收尾的安全盲区
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