通过优选建立了等效地层电导率变误差迭代搜索方法，提高了井眼环境校正的精度和稳定性。
A technique of variable-error iterative searching solution for equivalent formation conductivity is developed. The accuracy and stability of borehole correction are improved.
给出了临界加价率同临界毛利率的转换公式，说明他们对稳定性研究的等效性。
The transformation formula of critical markup rate and critical gross profit rate is given, and their equivalency for the stability study is illustrated.
本文用等效线弹簧模型计算裂纹转轴的动力稳定性问题。
In this paper, the equivalent line-spring model is employed to study the dynamic stability of a rotating cracked shaft.
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