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培训维修技术员，关于产品概念，原理和电路图。
Train repair technician on product concept, theory, circuit diagram.
youdao
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技术员需要认真研究产品说明书。
The engineer needs to carefully study the manufacture's data sheets.
youdao
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技术员需要认真研究产品说明书。
The engineer needs to carefully study the manufacture's data sheets.
youdao