Home / Standards / GBT 18780.1-2002 GBT 18780.1-2002 Geometrical product specifications — Geometrical features — Part 1: Basic terms and definitions 产品几何量技术规范 几何要素 第1部分基本术语和定义 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