单选题The three basic elements necessary for any fire are （）.Aheat, gas, and flamesBfuel, heat, and oxygenCheat, nitrogen, and fuelDfuel oil, nitrogen, and oxygen
单选题
The three basic elements necessary for any fire are （）.
A
heat, gas, and flames
B
fuel, heat, and oxygen
C
heat, nitrogen, and fuel
D
fuel oil, nitrogen, and oxygen
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