Systematically introduce a mining machine draw by electricity and its speed governed by system and way of brake by computers in a mining machine whose speed is governed by electromagnetism.
系统地介绍了电磁调速电牵引采煤机计算机控制调速系统的构成和制动运行方式，并对电磁调速采煤机的特点进行分析。
The second variable of supply chain management performance is velocity-or the speed of the supply chain . It is governed by the speed of access to good data, planning cycles and execution cycles.
影响供应链管理的第二个变量是周转率，或是供应环节速度。它取决于获得有效数据的速度，计划周期和执行周期。
The second variable of supply chain management performance is velocity-or the speed of the supply chain . It is governed by the speed of access to good data, planning cycles and execution cycles.
影响供应链管理的第二个变量是周转率，或是供应环节速度。它取决于获得有效数据的速度，计划周期和执行周期。
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