Using copper alloy mould to make the small-sized and thin wall ductile iron castings is a new technology in the foundry field.
采用铜合金金属型生产小型薄壁球墨铸铁件是铸造领域一项新技术。
Application of waterproof insulation board and aluminum alloy waterproof felt in the roof waterproof and insulation engineering;
防水保温板和铝合金金属防水毡在屋面防水隔热工程中的复合应用