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downhole electrodrill
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downhole electrodrill
Encyclopedia
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钻井新技术与装备
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downhole electrodrill
井下电动钻具
通过电缆进行井下供电及数据双向通讯,并利用井下电机驱动钻头破岩的钻井工具。
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polar coordinates
polar coordinates positioning
polar coordinates system
polar coordinate system
polar correspondence
polar crystal
polar curve
polar cushion
polar cusp
polar cycle
polar day
polar decomposition
polar decomposition theorem
polar determinant
polar diagram
polar dial
polar diameter
polar dielectrics
polar direction
polar discontinuity
polar displacement
polar distance
polar distance degrees
polar divisor
polar drfit
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