安全第 1307 / 1605 题
An acceptable oxygen concentration for confined space entry is generally in what range?
a.10% to 30%
b.19.5% to 23.5%
c.Any level is fine with a respirator
d.5% to 15%
解析
Normal breathable air is about 20.9% oxygen. Below 19.5% is oxygen-deficient and above 23.5% is oxygen-enriched (fire risk). Entry generally requires oxygen between 19.5% and 23.5%.
法律依据: 29 CFR 1926.1204(c)免费刷完整 1605 道题库 — 无需注册。
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