A fire starts when the following _____ factors come together.A.combustible materialB.ignit

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A fire starts when the following _____ factors come together.

A.combustible material

B.ignition source

C.oxygen

D.A and B and C

请帮忙给出正确答案和分析,谢谢!

热搜:a是b的充分条件,b是a的必要条件吗