运用平均数控制图的原理，解决控制港口煤尘污染的问题。
The problem of controlling the coal dust pollution of ports is solved by the principle of average controlling graph.
公差百分数控制图是在多品种小批量生产过程，对关键工序进行加工质量控制的工具。
The controlling diagram of tolerance percentage is a tool for controlling the process quality of key working procedure in multiple variety and small batch production.
公差百分数控制图是在多品种小批量生产过程中，对关键工序进行加工质量控制的工具。
The controlling diagram of tolerance percentage is a tool of controlling process quality of key working procedure in multiple variety and small batch production.
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