GB/T 40516-2021J类船用法兰连接金属阀门的结构长度标准
英文:Metal valves for use in marine J-flanged pipe face-to-face and centre-to-face dimensions GB/T 40516-2021介绍: 国家标准《J类船用...
英文:Metal valves for use in marine J-flanged pipe face-to-face and centre-to-face dimensions GB/T 40516-2021介绍: 国家标准《J类船用...