打磨和组装预制金属零件来打造重型工业机械和设备，如建筑，养殖，加工机械，铁路车辆和飞机发动机。
Fit and assemble prefabricated metal parts to build heavy industrial machinery and equipment such as construction, farming, and processing machinery, railway vehicles and aircraft engines.
在提高精度方面，新型飞机的零件加工精度普遍提高，普通比老产品提高1 ~ 2级。
Improve accuracy, new types of aircraft parts machining accuracy is generally better than the old product level 1-2.
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