其中一种是目前国内外在钻进参数分析中常用的指数形式，另一种是本文首次应用的多项式形式。
The one is index form that has being used in analyzing drilling parameters at home and abroad. The other, a new polynomial of degree four, is given out in the thesis.
其中一种是目前国内外在钻进参数分析中常用的指数形式，另一种是本文首次应用的多项式形式。
The one is index form that has being used in analyzing drilling parameters at home and abroad. The other, a new polynomial of degree four, is given out in the thesis.
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