The quality of aluminum_plastic composite tube is affected by plastic extrude machine, mode, welding machine of TIG AC/DC, traction engine etc. and also affected by raw material.
铝塑复合管产品质量直接受塑料挤出机、模具、交流脉冲氩孤焊机、牵引机等设备的机械性能及原材料质量的影响。
In the first chapter, studying the structure and running performance include the DC traction power supply and ac power supply system.
本篇论文第一章研究了城市铁路供电系统(包括直流牵引供电系统和交流供电系统)的构成和运行方式。
On the other hand, since traction power supply network is a AC-DC network, its running modes are complicated.
另一方面，地铁牵引供电网络是一个交直流混合的网络，运行方式较为复杂。
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