Step time changes are the first and most common method of simulated moving bed tuning.

改变步进时间，是最首要最常用的调整模拟移动床的方法。

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Three step method with three order accuracy is used for time discretion.

以三阶精度的三步法对时间离散。

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Three step method with three order accuracy is used for time discretion.

以三阶精度的三步法对时间离散。

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