1.

What is the ratio of the gases in medical air?

A. 78% Nitrogen, 21 % oxygen
B. 75 % Oxygen, 25 % Carbon dioxide
C. 60% Nitrogen, 20% Oxygen, 20% Carbon Di oxide
D. 50% Nitrogen, 50% Oxygen
Answer» B. 75 % Oxygen, 25 % Carbon dioxide


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