镀锌层是用来防止钢铁生锈的.A zinc coating is applied to the steel for rust protection.那儿的普通话听起来犹如带锯割镀锌筒一样.Common speech there sounds like a band saw cutting galvanized tin.热 浸镀 锌层引起疲劳强度的显著降低.A layer of hot - dipped galvanizing causes...
Diatomaceous earths are the skeletal remains of the tiny aquatic plants deposited centuries ago.硅藻土是百年前水生植物沉淀下来的遗骸.Belts of mountains are cause by movements in the earths crust.山丘带是由地壳移动而形成的.Rare Earths Group of South an...