For a fire to begin there must be present a combustible material, oxygen or air to （）combustion, and a source of heat at a temperature high enough to start combustion.<br>A:begin<br>B:support<br>C:last<br>D:extinguish

For a fire to begin there must be present a combustible material, oxygen or air to （）combustion, and a source of heat at a temperature high enough to start combustion.
A:begin
B:support
C:last
D:extinguish

出自：海船船员证

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