Nitrogen, Helium
No, that's not right. Close this feedback box to see the correct answer.
Carbon dioxide, Medical Air
No, that's not right. Close this feedback box to see the correct answer.
Oxygen, Entonox
Correct! Click Continue to go to the next page.
Medical Air, Nitrogen
No, that's not right. Close this feedback box to see the correct answer.
Which gases support vigorous burning?
Select one answer below
Q18
