1噪声对环境及人类的危害所谓噪声从物理学观点讲,就是各种不同的频率和声强的声音无规律的杂乱组合。从生理学观点看,就是指干扰人们休息、学习和工作的声音。拖拉机、农用运输车作业的噪声声源可分为两大类:一类是机内噪声,如发动机、底盘等发出的噪声;另一类是作业时的噪声, A noise on the environment and human harm The so-called noise from the physics point of view, is a variety of different frequency and sound intensity of the lawless messy combination. From the physiological point of view, refers to the interference of people rest, study and work voice. Tractors, farm vehicles operating noise sources can be divided into two categories: one is the machine noise, such as engine, chassis and other noise; the other is the operation of noise,