一些最高档的酒杯是用铅晶质玻璃制成的。Some of the finest drinking glasses are made from lead crystal.他参与了石油、锌和铅的勘探。He was involved in oil, zinc and lead prospecting.无铅汽油每加仑涨了1分多。Unleaded gasoline rose more than a penny a gallon....
To protective material used in surfacing and finishing flake off.用于保护表面材料的涂层或保护层因失去黏附力而剥落,脱落.For surfacing welding on cold die and cutting tool.冷冲模及切削刀具的堆焊.A new type of maraging steel metal powder cored wire for die TIG...