GB/T 41315-2022城镇燃气输配系统用安全切断阀标准
英文:Safety shut-off valves for city gas transmission and distribution system GB/T 41315-2022介绍: 国家标准《城镇燃气输配系统用安全切断阀》由333(...
英文:Safety shut-off valves for city gas transmission and distribution system GB/T 41315-2022介绍: 国家标准《城镇燃气输配系统用安全切断阀》由333(...