20 m3/s of air flow through a long wall panel having 1000 tpd of production. Between the intake and return of the panel, the firedamp increases from 0 to 0.2%. The rate of firedamp emission is
A. 3.45 m3/day
B. 3.45 m3/s
C. 3.45 m3/t
D. 3.45 l/g
Answer: Option C
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