%_Acute danger to human life (i.e. death) exists, if the concentration – McqOptions

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1.	%_Acute danger to human life (i.e. death) exists, if the concentration of CO‚Äö√á√á in atmospheric air exceeds __________ percent (by volume)._%
A.	1
B.	3
C.	7
D.	20
Answer» E.

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