例句與造句

1. The SEPTA power distribution system uses a 2 : 1 ratio autotransformer system, with the catenary fed at 12 kV and a return feeder wire fed at 24 kV . The New York, New Haven and Hartford Railroad used an 11 kV system between New York City and New Haven, Connecticut which was converted to 12.5 kV 60 Hz in 1987.
2. It's difficult to find return feeder in a sentence. 用return feeder造句挺難的