中科新闻网第三套军体拳:英语高手帮忙解决一下~!!!
来源：百度文库 编辑：中科新闻网 时间：2024/05/14 18:09:56
Most single-phase systems are supplied from a three-phase primary.The primary of a single-phase transformer is connected to one phase of the three-phase system.The secondary contains two coils connected in series with a midpoint tap to provide a single-phase,three-wire system.This rangement is generally used to supply power to residential occupancies and some commercial establishments.A schematic diagram is shown in Fig.
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