This article studied the technical and economic features and cost evolution law of coal enterprise.
本文研究了煤炭企业经济技术特征与成本演变规律。
The petroleum enterprise is a special trade and its culture has its own special features.
石油企业是一个特殊的行业，石油企业文化有其独特的个性。
The petroleum enterprise is a special trade and its culture has its own special features.
石油企业是一个特殊的行业，石油企业文化有其独特的个性。
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