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Is oxygen the only gas ______helps fire burn?

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no oxygen is needed  oxygen is necessary  oxygen is given off  no gas is produced  
that    /    which    it  
that    /    which    it  
that    /    which    it  
stopping the flow of gas  reducing the chemical chain reaction  increasing the oxygen supply  cooling below the autoignition point  
flame safety lamp  combustible gas indicator  gasometer  oxygen indicator  
without it    without that    without which    if not  
if there is sufficient oxygen to support life  the toxicity of flammable gases or vapors  the amount of CO2 present in flue gas  the presence of flammable gases or vapors in the air  
that    X    which    it  
The lower / the worse  The higher / the better  The lower / the better  The highest / the worst  
that  /  which  it  
concentrations of explosive gas  an oxygen deficiency in a space  the presence of harmful amounts of carbon monoxide  All of the above  
that   /   which   what
  
purifies  combinations  concentrations  filters  
the amount of oxygen in a space  the presence of harmful amounts of carbon monoxide  concentrations of explosive gas  All of the above  
heat, gas, and flames  fuel, heat, and oxygen  heat, nitrogen, and fuel  fuel oil, nitrogen, and oxygen  
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