Home / Standards / GB/T 20501.1-2013 GB/T 20501.1-2013 Active Public information guidance systems - Design principles and requirements for guidance elements - Part 1: General 公共信息导向系统 导向要素的设计原则与要求 第1部分：总则 Standard Type GBT ICS 01.080.01 CCS A22 Status 现行 Issue Date 2013-07-19 Implementation 2013-11-30 Responsible Dept 国家标准委 Drafting Unit N/A