本文提出了假想零线的方法，概念清楚，能够大大简化计算过程。
The paper presents the supposed zero line method which has clear concept and can simplify the calculation procedure.
本文还提出了一种压力零线的修正方法，给出了示功图分析应用的几个实例。
In this paper, a correctional method of pressure zero line is proposed and some practical examples of the analysis and application of indicator diagrams are introduced.
当配线采用多相导线时，其相线的颜色应便于区分，相线与零线的颜色应不同。
When the wires are multiphase conductor, it should be easy for us to distinguish the colors, and the color of phase should be different from that of the zero line.
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