Part four: the analysis to the necessity of drawing into the proportional principle.
第四部分：我国引入比例原则的必要性分析。
Layout analysis is the foundation of engineering drawing recognition.
工程图版面分析是实现自动读图的前提。
The analysis result provides a basis for drawing the specifications of pressure vessels.
分析结果为编制以可靠性分析为基础的压力容规范提供了依据。
The analysis result provides a basis for drawing the specifications of pressure vessels.
分析结果为编制以可靠性分析为基础的压力容规范提供了依据。
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