Zinc Alloy nyem kov ntsuas

Tsev Dhau phab 1234567 Sab tom qab no Rau sab kawg 1/12
Xav paub dawb los yuav zoo zinc phom tuav kov xauv los ntawm kev kho khoom kho khoom muag khoom ntawm no. Rau cov lus thiab nqe, txais tos hu rau peb.