검색 결과: "Train station"
범주 · 모든 커뮤니티
Power transformers are the main element of power electrical substations in electrical systems, urban, regional or other level and are designed to increase/decrease voltages in electric networks (tens to hundreds of thous…
A mobile phone is a device that can make and receive telephone calls over a radio link while moving around a wide geographic area. It does so by connecting to a cellular network provided by a mobile phone operator, allow…