单项选择题
A.20% B.30% C.40% D.50%
A.100m B.110m C.120m D.130m
A.1m B.1.2m C.1.5m D.1.8m
A.单排外脚手架 B.双排外脚手架 C.单排里脚手架 D.双排里脚手架
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