Home / Standards / GB/T 4728.5-2005 GB/T 4728.5-2005 Abolished Graphical symbols for diagrams Part 5 Semiconductors 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 29.020 CCS K04 Status 废止 Issue Date 2005-03-03 Implementation 2005-08-01 Responsible Dept 国家标准委 Drafting Unit N/A