【单选题】【消耗次数：1】
一单层建筑物净高6.8m，顶棚粉刷搭设满堂脚手架，其增加层数为【】
①
1
②
2
③
3
④
4
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相关题目
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脚手架工程是指：高度超过24m的落地式钢管脚手架、（ ）、悬挑式脚手架、挂脚手架、吊篮脚手架。
①
落地式钢管脚手架
②
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门型脚手架
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卸料平台
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木脚手架
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