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【单选题】
下列关于人工挖桩施工的安全措施,表述错误的是( )。A.
设置应急软爬梯供人员上下。
B.
每日开工前须检测井下的有毒、有害气体,坚持挖作业排水送。
C.
已完未完均须设置护栏。
D.
当桩净距小于5m 时,应采用间隔开挖。
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