求翻译：电压相量U1 电压相量U2是什么意思？

Voltage phasor voltage phasor U2 U1

Voltage-volume 1 U U voltage sang Volume 2

The transformer may divide into according to the use: The distribution transformer, the power transformer, all seal the transformer, the combined transformer, the dry transformer, the oil bath type transformer, the single phase transformer, the electric stove transformer, the rectification transform

Voltage Phasor voltage Phasor U1 U2

Voltage Phasor voltage U1 U2