本文阐述了零件图CAD绘图的特殊性，提出编制零件图绘图程序的方法。

This paper expounds the particularity in CAD drafting detail drawings of a crane and proposes a method for programming of drafting detail drawings.

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指出暖通空调施工图绘图表示方法迫切需要规范统一，以提高设计效率和设计质量。

Holds that currently used drawing expression methods need to be regulated and unified to improve design and raise efficiency.

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定义明确的UML交互图比非正式的绘图实际得多。

Well-defined UML interaction diagrams are far more practical than informal drawings.

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