GB/T 39245.2-2020管法兰用金属齿形组合垫片第2部分:Class系列标准
英文:Grooved metal gaskets with covering layers for pipe flanges—Part 2:Class designated GB/T 39245.2-2020介绍: 国家标准《管法兰用金属齿...
英文:Grooved metal gaskets with covering layers for pipe flanges—Part 2:Class designated GB/T 39245.2-2020介绍: 国家标准《管法兰用金属齿...