Main boring diameter for petroleum well is 20-30 cms in diameter, while the depth of the oil well may be about _____________ kms?
(A) 0.1 to 0.5
(B) 1.5 to 4.5
(C) 7.5 to 12.5
(D) 15-20
Main boring diameter for petroleum well is 20-30 cms in diameter, while the depth of the oil well may be about _____________ kms?
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