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

Oxygen content below __________ percent in air contaminated with nitro

1.	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» C. 14

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

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