Due to the specialty, REF relay is a current relay with very high sensitivity or a voltage relay with very low acting power.

由于零差保护的特殊性，零差继电器本身就是一只灵敏电流继电器或动作功率很小的电压继电器。

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Then,the car automatically switches to a gas-powered engine, acting as a generator that can power through 483 more kilometers.

VOA: standard.2010.07.30

In addition to drawing electricity, plugged-in cars would also be able to send electricity stored in their batteries back into the grid as needed, acting like tiny power plants.

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"It requires a real vision and acceptance that this strategic partnership is the only alternative to a world in which we break up into different poles of power, acting as rivals to one another, with every single dispute in the world being played off against these different poles of power, " he said.

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The U.S. should start acting as a true Great Power.

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