Main boring diameter for petroleum well is 20-30 cms in diameter...

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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

Answer: Option B

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