【化】 铁三素组(指铁钴镍); 铁类金属; 铁基金属; 黑色金属

quality first

first party

be bent solely on profit; put profit first

last-in first-out method of inventory costing【会计】

people regard food as their prime want; food the first necessityof man

first heart sound, S1

last-in first-out memory

first-order difference equation