単相 たんそう交流 こうりゅうではありませんでした
tansōkōryūdewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 単相交流

1. Was not single-phase alternating current.; Was not a single-phase AC current.

Past/Perfective
Negative
Polite
Formal Register
Electrical Engineering