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Biology, 26.06.2019 08:00 twil85459

2. which technique is used to recover natural gastronthe subsurface? a. open-pit mines are dug. b. a vertical hole is drilled. c. room-and-pillar mining is used. d. longwall mining is used.

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2. which technique is used to recover natural gastronthe subsurface? a. open-pit mines are dug. b. a...
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