Which condition is necessary for a substance to burn?（）<br>A:The temperature of the substance must be equal to or above its fire point<br>B:The air must contain oxygen in sufficient quantity<br>C:The mixture of vapors with air must be within the explosive range<br>D:All of the above

Which condition is necessary for a substance to burn?（）
A:The temperature of the substance must be equal to or above its fire point
B:The air must contain oxygen in sufficient quantity
C:The mixture of vapors with air must be within the explosive range
D:All of the above

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