干线供电，市电电源，交流电源

市电电源；干线供给；交流电源

mains supplies───干线电源

floating supply───浮动供给

money supply───[金融]货币供应量；货币供给

water supply───供水系统；水源

housing supply───住房供应量

excess supply───超额供给

labour supply───劳动力供应

blood supply───血液供给

fuel supply───供油；[能源]燃料供给

Connect piping system to water mains, supply tanks, pumps, compressors and control equipment.───为水库, 泵, 压缩机和控制设备连接管道系统和给水总管.

They bought a house with no mains supply.

One of these is simply to reduce the 240 volt mains supply down to the much lower voltage required by the circuit.

For instance, the Expert can observe regular patterns of irregularities in the mains supply and anticipate them in future.

After the mains supply recovers, the supervisory system can implement automatic equalizing charge management over the battery.

It is not enough to switch off at the mains supply.