Cad have already replaced the t - square and drawing board and become to design the main tool of the personnel along with the cad technique development , and consumedly lower the labor strength of the design personnel , and increase the work efficiency of the design personnel 随着cad技术的发展, cad已经代替丁字尺和图板成为设计人员的主要工具,大大降低了设计人员的劳动强度,提高了设计人员的工作效率。
百科解释
A T-square is a technical drawing instrument used by draftsmen primarily as a guide for drawing horizontal lines on a drafting table. It may also guide a set square to draw vertical or diagonal lines.