An toànCâu 452 / 521
A standard guardrail system's top rail must be approximately what height above the walking/working surface?
a.About 30 inches
b.About 42 inches (plus or minus a few inches)
c.About 54 inches
d.About 24 inches
Giải thích
The top rail of a standard guardrail is about 42 inches above the surface, high enough to stop a worker from going over. 30 or 24 inches is too low to be effective, and 54 inches is higher than the standard specifies for the top rail.
Trích dẫn luật: Cal/OSHA Title 8 §3209Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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