The core drilling method and the obtained achievement are introduced with respect to the bit and core barrel used in different formation.
根据不同地层所采用的钻头和取心器，介绍了不同地层的钻进取心方法和取得的成果。
The amplitude-frequency relation with respect to the natural frequency of the lowest order and amplitude-frequency response under harv monic force were obtained by considering single mode vibration.
考虑单模态振形，得到了相应于最低阶特征频率的幅频关系和受谐和激励的幅频响应。
Inverse Jacobi matrix of robot was obtained by means of the differentiation with respect to input and output equations for positions of 6-sps typed parallel robot.
通过对6 - SPS型并联机器人位置输入输出方程微分，获得机器人逆雅可比矩阵。
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