Bridges and Culverts MCQ with Answers

21) What is the minimum percentage of oxygen concentration in underground air quality for tunnel?

Answer is:

0.195

Bridges and Culverts MCQ with Answers

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Related Bridges and Culverts MCQ with Answers

22) What is the maximum noise levels of ventilation fans while measure at the closest point of employee exposure?

Answer is:

90 decibel

Bridges and Culverts MCQ with Answers

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