( base metals)
A base metal is a metal such as copper, zinc, tin, or lead that is not a precious metal.
≠ precious metal
N-VAR
( base metals)
A base metal is a metal such as copper, zinc, tin, or lead that is not a precious metal.
≠ precious metal
N-VAR
Collins COBUILD Advanced Learner's English Dictionary. Английский словарь Коллинз COBUILD для изучающих язык на продвинутом уровне. 2006