problems as the main line
problems as the main line
以问题为主线
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Analysis and discussions are made on certain technical problems occurring during the test of AC4000, the first ac drive main line electric locomotive as well as the causes thereof.
对国产首台ac4000交流传动干线电力机车试验中暴露出的几个技术问题及其原因进行了初步的分析与探讨。
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