建筑机械运行时会产生振动,它会加速零件的损坏,使噪声增大,致使司机疲劳,有着有害的一面。但是,辩证法告诉我们,绝对的“有害”是不存在的。科学史表明:为了消除某一有害的物理现象,往往会从它的相反方面开发出有益的新技术。如电火花加工就是研究消除电器开关的电蚀问题而开 When the construction machinery is running, it will generate vibrations, which will accelerate the damage of the parts, increase the noise, and cause the driver to fatigue and have a harmful side. However, dialectics tells us that absolute “harmful” does not exist. The history of science shows that in order to eliminate a harmful physical phenomenon, beneficial new technologies are often developed from its opposite. For example, EDM is to study the problem of eliminating the electrical erosion of electrical switches.