Home / Standards / GB/T 11321-1989 GB/T 11321-1989 Active Guide for choosing modular dimensions for waveguide components 波导元件模数尺寸选择指南 Standard Type GBT ICS 33.120.10 CCS L26 Status 现行 Issue Date 1989-03-31 Implementation 1990-01-01 Responsible Dept 工业和信息化部(电子) Drafting Unit N/A