GBT17791-2017 空调与制冷设备用铜及铜合金无缝管.pdf
空调与制冷设备用铜及铜合金无缝管Seamlesscopperandcopperalloystubeforairconditionerandrefrigerationequipment2017-07-12发布2018-02-0...
GBT17791-2017空调与制冷设备用铜及铜合金无缝管.pdf
