在本世纪80年代末期,金属工业的生产状况与10～15年前的情况有很大变化。这期间发生了许多结构上的变化,大多数是对生产厂家产生消极影响的。自70年代中期以来,所有金属的价格处在低落之中。在1970～1986年期间,按不变美元价值确定对比指数,铝、铜、铅、镍、 In the late 1980s, the production of the metal industry changed dramatically from 10 to 15 years ago. During this period many structural changes have taken place, most of which have a negative impact on manufacturers. Since the mid-1970s, the prices of all metals have been depressed. During the period from 1970 to 1986, the comparative index was determined based on the constant dollar value, and the prices of aluminum, copper, lead, nickel,