Knowing the power supply and charger test process and be familiar with test instrument.

了解电源和充电器的测试过程，会使用相关测试设备。

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I am not familiar with this instrument. However it is good that there are many harmonica manufacturers, so that we have many choices.

对这款乐器，我不熟悉。然而口琴生产厂家多了，对我们是件好事，因为我们的选择余地多了。

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Be familiar with PLC, VFD and instrument control system, held at least two years maintenance experience in the field.

熟悉plc，变频器，自控仪表，有2年以上相关维护工作经验。

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