单选题A combustible gas indicator meter is calibrated to read the percentage of（）.Avapor to oxygenBthe flammable limit concentrationCthe autoignition concentrationDthe lower explosive limit concentration
单选题
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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