A.20% B.10% C.15% D.6%
A.操作高度5m以上部分 B.6m以上部分 C.超過(guò)6m時(shí)、操作地面以上全計(jì)取 D.層高超過(guò)5m時(shí)
A.1對(duì)對(duì)絞電纜 B.2對(duì)對(duì)絞電纜 C.3對(duì)對(duì)絞電纜 D.4對(duì)對(duì)絞電纜