什么是貨運(yùn)等級(jí)？What is Freight Class?The National Motor Freight Traffic Association (NMFTA) defines a class as a way “to establish a commodity’s transportability.”美國(guó)國(guó)家汽車貨運(yùn)交通協(xié)會(huì) (NMFTA) 將類別定義為“建立商品可運(yùn)輸性”的一種方式。