The tests for the effects of jet position on drag bit cutting process were described.
就射流相对于刀具的四处不同位置对切割效能的影响进行了测试。
Drilling with cone( drag) bit in the section.
此段地层采用牙轮（刀）头钻进。
We do 7 drag a little bit, but notes are our problem.
我们虽然唱得有点拖拉，只不过是找不准调子。
We do 7 drag a little bit, but notes are our problem.
我们虽然唱得有点拖拉，只不过是找不准调子。
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