Oxygen content below __________ percent in air contaminated with nitrogen does not support combustion and is unsafe for humane exposure.

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Question: Oxygen content below __________ percent in air contaminated with nitrogen does not support combustion and is unsafe for humane exposure.
[A].

18

[B].

16

[C].

14

[D].

12

Answer: Option B

Explanation:

No answer description available for this question.