Safety第 88 / 100 题
What is a key requirement when setting up an extension ladder against a wall?
a.Lean it as steeply as possible
b.Place the base right at the wall
c.Set it at roughly a 4-to-1 ratio (base one foot out for every four feet of height) and secure it against slipping
d.Rest it on a stack of paint cans for height
解析
A stable extension ladder is positioned so the base is about one foot away from the wall for every four feet of working height, giving roughly a 75-degree angle. It should be on firm, level ground and secured against slipping, extending above the landing when used for access. This reduces the risk of the ladder kicking out or tipping.
法律依据: Cal/OSHA Title 8免费刷完整 100 道题库 — 无需注册。
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