Question: please answer all A Question 5 (Mandatory) (5 points) Retake question What percent of oxygen does an oxygen deficient atmosphere start? A Question 6 (Mandatory)

please answer all please answer all A Question 5 (Mandatory) (5 points) Retake question What

A Question 5 (Mandatory) (5 points) Retake question What percent of oxygen does an oxygen deficient atmosphere start? A Question 6 (Mandatory) (5 points) Retake question What percent of oxygen does oxygen rich atmosphere contain? A Question 7 (Mandatory) (5 points) Retake question What are the two major sources of injuries in construction industry? and

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