complement of an angle [数] 余角
With the method of industry design, I analyze and compare the mechanical systems, make out of the best design project, then lay the foundation of gas valve design from the Angle of complement.
这里应用工业设计思想，从系统的角度出发对天然气阀的机械系统进行了分析比较，得出了最佳设计方案，为天然气阀的设计奠定了基础。
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