Home / Standards / GB/T 33431-2016 GB/T 33431-2016 Active Guide for bell mouth thickness design 锚唇厚度设计指南 Standard Type GBT ICS 47.020.50 CCS U20 Status 现行 Issue Date 2016-12-30 Implementation 2017-07-01 Responsible Dept 国家标准委 Drafting Unit N/A