采用单值-移动极差控制图考察了2004年和2005年块铁矿的品质波动情况。

The quality fluctuation of 2004/2005 lump iron was inspected with Charlie Control Chart.

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本文结合实际介绍一种SPC控制图方法，即均值—移动极差控制图法，以控制磷化参数。

This text combines practice to introduce a kind of SPC control diagram method, that is mean value-ambulation difference control diagram method, to control phosphating parameters.

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本文结合实际介绍一种SPC控制图方法，即均值— 移动极差控制图法，以控制磷化参数。

This text combines practice to introduce a kind of SPC control diagram method, that is mean value—ambulation difference control diagram method, to control phosphating parameters.

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