图1说明,近年来各国铸件产量均有下降的趋势,但美国的铸件产量则是大幅度下跌。从图1、图2都可看出,这次下跌的最低点是82年。与78年比,铸件产量下降了841万吨,相当日本83年铸件总 Figure 1 shows that in recent years, casting production all over the country have shown a downward trend, but the United States is a sharp drop in casting output. As can be seen from Figure 1 and Figure 2, the lowest point of this decline is 82 years. Compared with 78 years, the output of castings decreased by 8.41 million tons, equivalent to 83% of Japan’s total castings