电流的主要效应是磁效应，热效应和化学效应。
The chief effects of electric currents are the magnetic, heating and chemical effects.
电流的主要效应有磁效应、热效应和化学效应三种。
The chief effects of electric current are the magnetic, heating and chemical effects.
电流三种最重要的效应是热效应、磁效应和化学效应。
The three most important effects of an electric current are heating, magnetic and chemical effects.
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