If a ladder cannot be secured, then ask someone to hold it firmly for you. Ladders should extend at least 1m above landing.
l如果梯子不稳，请同事帮忙扶紧。梯子顶端必须超出爬升落脚点至少1米。
If a ladder cannot be secured, then ask someone to hold it firmly for you. Ladders should extend at least 1m above landing.
l如果梯子不稳，请同事帮忙扶紧。梯子顶端必须超出爬升落脚点至少1米。
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