Home / Standards / GBT 4728.5-2018 GBT 4728.5-2018 Graphical symbols for electrical diagrams — Part 5: Semiconductor devices and electron tubes 电气简图用图形符号 第5部分:半导体管和电子管 Standard Type GBT ICS N/A CCS N/A Status N/A Issue Date N/A Implementation N/A Responsible Dept N/A Drafting Unit N/A