Common HazardsCâu 34 / 100
Which factor most increases the danger of a trench collapse?
a.Dry, cool weather
b.Previously disturbed soil, water intrusion, and vibration from equipment
c.A shallow depth of 1 foot
d.Bright sunlight
Giải thích
Previously disturbed soil, water accumulation, and vibration from nearby traffic or equipment all increase the likelihood of a trench collapse. A competent person must evaluate these conditions. Soil that has been dug before does not hold together as reliably as undisturbed ground.
Luyện miễn phí toàn bộ 100 câu hỏi — không cần đăng ký.
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