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[单选题]
附着式升降脚手架提升装置中,上吊环安装在() ,用来连接 电动葫芦上钩,使他们有效的链接在一起,下吊块安装在桁架底部用来连接电葫芦下钩,使整个提升装置跟底部桁架连接。
A
支座底部
B
支座中部
C
支座上部
D
支座与吊环垂直处
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试题答案:
B
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