员工离职率的控制和改善。

The control and improvement of operator turn over.

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对相位屏的方差、低频特性进行了有效控制和改善。

And how to control phase screen parameters and improve low frequency characteristic are also described in detail.

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术前对患者进行心理护理，健康指导，控制和改善患者的全身情况。

Preoperative nursing, including psychological nursing, and health education, was given to patients to control and improve the general condition of the patients.

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