母线排、零线排、保护接地排采用自行设计的绝缘支架安装，结构合理，互换性强。
Bus bar , zero line bar and protective earth bar adopt the self-designed insulation support, characterized by rational structure and better interchangeability;
讨论了内孔为细长孔，孔的母线为等加速曲线的喷嘴零件的加工方法。
And discusses a machining way when the hole is thin and long, then take the bus-bar of the hole as the constant acceleration curve spray nozzle part.
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