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There are two traditional ways to determine the directions of the gears in common textbooks, one is the way of positive and negative sign, and the other is the way of arrow.

教材介绍的是两种传统方法,即正负号法和箭头法。

Realizing arrow confluence and cloud-shape symbol of Word drawing in AutoCAD;

在AutoCAD中实现Word绘图中的箭头总汇及云状标注符号

The concept and algorithm of arrowhead-match is presented.

本文提出了箭头匹配的概念，总结了９种箭头匹配模式和１５种箭头匹配的前趋分析模式。

This paper puts forwards a method for automatically generating line based on the recognition of arrow symbol.

提出了一种基于图形箭头符号识别的直线图形自动生成方法。