You slant the pen with an angle of 30 degrees on the paper when you're writing.
你书写的时候笔身是倾斜的，和纸张形成30度的倾角。
In this paper base tangent length is put forward and lead angle calculating formula is deduced.
这篇文章提出了公法线长度并推导出超前角的计算公式。
In this paper, in studying absolute Angle measurement principle basis designed coding rules of a Single-ring code and formulated the appropriate software algorithm.
本文对绝对编码法测角原理进行研究的基础上，设计了一种具有发明专利的单码道编码规则，并根据规则制定了相应的软件算法。
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