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A ground is a region of approximately zero voltage.
接地是一个地区的约零电压。
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Several zero voltage and zero current switching PWM push pull three level converters are proposed.
最后，本文还提出了另外几种零电压零电流开关PWM推挽三电平直流变换器。
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Very low zero cross voltage.
非常低的过零触发电压。
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Very low zero cross voltage.
非常低的过零触发电压。
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