随着工业生产的不断发展,各类工业机械不论是机械的种类还是数量,都在不断扩大,而且近年来,还不断朝大马力、高转速方向发展,由此而产生的工业和环境噪声的污染也日趋严重.产生噪声的机械范围广、门类多,如动力、建筑、运输、冷热机加工、化工、纺织、矿山、冶金、印刷、食品、无线电等,哪里有机械,哪里就有机械噪(?) With the continuous development of industrial production, the types and quantities of industrial machinery, whether mechanical or mechanical, are constantly expanding. In recent years, industrial machinery and environmental noise have also been constantly developing toward high horsepower and high speed. Pollution is becoming more and more serious.Noises generated by a wide range of machinery, a wide range of categories, such as power, construction, transportation, hot and cold machining, chemical, textile, mining, metallurgy, printing, food, radio, where machinery, where there is machinery noise(?)