Which of the following symptoms show that the combustion in air is nec

1.	Which of the following symptoms show that the combustion in air is necessarily complete:
A.	Absence of oxygen in exhaust
B.	Absence of nitrogen in exhaust
C.	Absence of free carbon in exhaust
D.	Absence of carbon monoxide in exhaust
Answer» D. Absence of carbon monoxide in exhaust

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Which of the following symptoms show that the combustion in air is necessarily complete:

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