题目内容：
完整地论述，大部分燃烧发生和发展必须具备（ ）四个条件。
A．可燃物 B．爆炸极限
C．助燃物
D．引火源
E．链式反应自由基
参考答案：
答案解析：
多选题：完整地论述，大部分燃烧发生和发展必须具备（ ）四个条件。
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B．爆炸极限
C．助燃物
D．引火源
E．链式反应自由基
B．爆炸极限
C．助燃物
D．引火源
E．链式反应自由基
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