GB/T 4728.2-2018电气简图用图形符号第2部分:符号要素、限定符号和其他常用符号国家标准
英文:Graphical symbols for electrical diagrams—Part 2:Symbol elements,qualifying symbols and other symbols having general ...
英文:Graphical symbols for electrical diagrams—Part 2:Symbol elements,qualifying symbols and other symbols having general ...