The exact computing formulas for the normal chord length and the set angle of the gear tooth micrometer callipers have been derived here.

本文导出了法向弦长和公法线千分尺安置角的精确计算公式。

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Of cause on viewing it , the judge should apply the object standard —the normal person , not the defendant angle, so as to make it easy to operate and to set up a general standard .

当然在具体判断时亦采客观性标准即一般人而非当事人的标准去判断是否可预见、可避免。其目的是树立一般行为准则，降低操作难度。

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