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  • The reasons for large variations of azimuthal and zenithal angles of holes drilled are investigated with a view point of mechanics.

    从力学观点分析了钻孔方位角和顶角变化的原因；

    youdao

  • The reasons for large variations of azimuthal and zenithal angles of holes drilled are investigated with a view point of mechanics.

    从力学观点分析了钻孔方位角和顶角变化的原因；

    youdao

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