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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 [Wrong Answer] |
B. | 1.5 to 4.5 [Correct Answer] |
C. | 7.5 to 12.5 [Wrong Answer] |
D. | 15-20 [Wrong Answer] |