在杆子，梯子或其他支撑结构上爬高作业，或在密闭的空间内工作，如坑道，隧道和爬线路空间。
Climb and work aloft on poles, ladders or other support structures or work in confined Spaces such as trenches, tunnels and crawl Spaces.
在杆子，梯子或其他支撑结构上爬高作业，或在密闭的空间内工作，如坑道，隧道和爬线路空间。
Climb and work aloft on poles, ladders or other support structures or work in confined Spaces such as trenches, tunnels and crawl Spaces.
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