The dielectric constant decreased significantly under large DC bias level.

在较大的直流偏压场下，介电常数大幅度降低。

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Since the DC current on each side is the same, the effective DC in the transformer core is cancelled, so there is no need to provide for a large DC component.

因为两臂的直流电路相等而方向相反，所以在变压器铁心中有效直流磁通是互相抵消的，所以不再需要巨大的直流元件。

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The experience of designing the serial communication program between PC and 89c51 micro-controller for the speed control of large DC motor is introduced by some examples.

通过实例，介绍为大型直流电机调速系统开发PC机与89c51芯片之间串行数据通信的经验。

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