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If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains_______________?

/ Civil Engineering Mcqs, Waste Water Engineering / By
If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains_______________?

A. Hydrogen sulphide
B. Carbon dioxide
C. Methane
D. Oxygen