中国石油大学 / 中石油
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14. To select a bit, several factors should be considered, they are _____________________
A、the nature of the rocks to be drilled.
B、the location of the well
C、the depth in the earth.
D、rock formations (anticipated)
E、cost of the bit
A、the nature of the rocks to be drilled.
B、the location of the well
C、the depth in the earth.
D、rock formations (anticipated)
E、cost of the bit
参考答案：