GB/T 17791-2017空调与制冷设备用铜及铜合金无缝管国家标准
英文:Seamless copper and copper alloys tube for air conditioner and refrigeration equipment GB/T 17791-2017介绍: 国家标准《空调与制冷设...
英文:Seamless copper and copper alloys tube for air conditioner and refrigeration equipment GB/T 17791-2017介绍: 国家标准《空调与制冷设...