Underground coal mines are in principle ventilated by exhausting syste – McqOptions

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1.	Underground coal mines are in principle ventilated by exhausting system, so that
A.	spontaneous heating risk is reduced
B.	fumes can be quickly removed in case of an underground fire
C.	build-up of methane concentration is decreased
D.	cool and fresh intake air can enter underground
Answer» D. cool and fresh intake air can enter underground

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