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解决了采煤机牵引部准确全面试验的问题。
It solves the problem which is the right test of coal machine draw part.
youdao
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完成了该制动机的单车试验与牵引列车定置试验。
It is completed that is test of single vehicle and immovable train.
youdao
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完成了该制动机的单车试验与牵引列车定置试验。
It is completed that is test of single vehicle and immovable train.
youdao