概况 在党的正确领导下,在三面红旗的光辉照耀下,随着国民经济的不断发展,机器制造业正向着多品种、高质量、高效率的方向迅速发展。因而在国防、石油、化工、煤炭、机电各类设备及仪器仪表等产品中,特种材料与高精度的深孔加工零件不断地出现。例如重型机器设备中的深孔零件, Under the correct leadership of the party and under the bright red light of the three red flags, with the continuous development of the national economy, the machinery manufacturing industry is developing rapidly in the direction of diversification, high quality and high efficiency. Thus in the national defense, petroleum, chemical, coal, electrical and mechanical equipment and instrumentation and other products, special materials and high-precision deep-hole processing parts continue to appear. For example, deep hole parts in heavy machinery and equipment,