Qhov pib zoo rau lub xyoo tshiab: ob ib puag ncig tiv thaiv galvanizing kab

Lub Rau Hli 2018, nws tau koom nrog hauv GALVA2018 kev sib tham thiab kev sib tham los ntawm European Galvanizing Association hauv Berlin, Lub Tebchaws Yelemees.