大多数经理试图正负双法并举，激发员工的积极性。

Most managers attempt to influence employee motivation using both positive and negative approaches.

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对可能出现反向电压的电路，应选择双极性电容器。

Please use bi-polar capacitors for a circuit that can possibly see reversed polarity.

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为克服高频脉冲交流环节逆变器存在的电压过冲现象，本文提出和研究了单极性、双极性移相控制策略。

To overcome voltage stress existed in the inverter with high frequency AC pulse link, single polarity and double polarities phase shifting control strategies were proposed and studied in this paper.

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