Maintenance department: maintenance industries circuit boards, machine equipment system, main board, controller, power supply, frequency converter, PLC and touch screen.

维修部：维修各行业电路板，机加工设备系统，主板，控制器，电源，变频器，PLC触摸屏等。

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The portable blade frequency measurement instrument based on DSP is designed next. The DSP-based circuit board is made and the software program for testing hardware circuit board is coded.

论文完成基于DSP芯片的便携式叶片频率测试仪的硬件电路设计和电路板的制作，并完成对电路板的测试。

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The characteristic of thermosetting polyphenylene oxide resin copper clad laminates as wel as their application in the high frequency printed circuit board is introduced.

论述了热固性聚苯醚树脂基覆铜板的特性及其在高频印刷电路板上的应用。

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