Laboratory experiments proved, suddenly comprising gas air mixture of containing as low as . . . . . . . . % and as high as . . . . . . . . % firedamp can be ignited and made explosive both the temp. and pressure raised simultaniously.
A. 2%; 75%
B. 3%; 80
C. 2.5; 65
D. 5; 79%
Answer: Option A
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