| |||
network frequency | |||
line-frequency; mains-frequency; line frequency | |||
commercial frequency | |||
mains frequency; power frequency | |||
industrial frequency | |||
| |||
power frequency |
工业频率 : 7 phrases in 5 subjects |
General | 1 |
Geophysics | 2 |
Metallurgy | 2 |
Oil / petroleum | 1 |
Technology | 1 |