它是企业经营思想的体现，是一系列战略性决策的结果，又是制定中长期计划的依据。

It is the embodiment of the business mentality, and a result of a series of strategic decision, it is the basis of the long-term plan while making.

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该系列于1958年首次投入使用，现在用于中长途货运。

They were first put into service in 1958 and were now used for middle-and-long range cargo transport.

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论述目前机械基础系列课程实验教学中长期存在的问题。

This paper discussed the existing teaching problems in mechanical base experiments and put forward a basic thought of teaching reform on mechanical base experiments.

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