本市某针织厂过去品种结构不太理想,微利产品占的比例较大,经济效益较差。最近,该厂改变了品种结构,使原来几只“老面孔”产品得到了“更新换代”。如原来的粘棉圆领衫逐渐被款式新颖的全棉绣花衫所代替,提高了产品的“身价”。然而与此同时,该厂的产量却下降了不少,从 In the past, the knitting structure of a knitting factory in the city was not very ideal, and the proportion of meager profit products accounted for a large proportion and the economic efficiency was relatively poor. Recently, the plant has changed the structure of its products, which has resulted in the replacement of several old “old faces” products. For example, the original cotton t-shirt was gradually replaced by a fashionable cotton embroidered shirt, which improved the product’s “worth.” At the same time, however, the output of the plant has dropped by a