从实际供应链系统的构成入手，分析了供应链的实体元素和活动过程。
Starting with composing of practical supply chain system, we analyze the entity elements and their action process in the system.
它将实体元素具体化，易于建立相对客观的度量标准，具备实际操作的可行性。
It also is easy for practice because it embodies the concrete elements that are easy to quantify and measure in a comparatively objective way.
介绍压力容器上实体元素的测量，测量坐标系的建立与转换，以设计基准评定制造精度。
Introducing method of measuring the points on the pressure vessel, establishing and transforming coordinate systems, estimating accuracy of manufacture with design standard.
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