39.可將三相電源轉換成二相輸出電源的變壓器連接方式為下列何者？ (A) V-V 接線(open delta-open delta connection) (B) U-V 接線(open wye-open delta connection) (C) T 型接線(T connection) (D)Δ-Y 接線(delta-wye connection)