A combustible gas indicator meter is calibrated to read the percentage of（）.<br>A:vapor to oxygen<br>B:the flammable limit concentration<br>C:the autoignition concentration<br>D:the lower explosive limit concentration

A combustible gas indicator meter is calibrated to read the percentage of（）.
A:vapor to oxygen
B:the flammable limit concentration
C:the autoignition concentration
D:the lower explosive limit concentration

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