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| 英汉对照参考资料(9) | |
| 引用本文： | 林生剑秋.英汉对照参考资料(9)[J].探矿工程,1984(3):62-62. |
| 作者姓名： | 林生剑秋 |
| 摘 要： | MWD todayEastman Whipstock, Inc.''s Pilot tool employs a sole-noid-operated valve to generate negative, or low pres-sure, pulses in the mud stream. The valve, that is nor-mally closed, opens to bypass drilling fluid from the toolbore to the annulus.Power f |
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