在线等,汉换英
来源:百度知道 编辑:UC知道 时间:2024/09/21 06:28:46
I do not think the United States is a quiet country. People hearing the highest accepted 30 db to be sound, sustained when the room's noise pollution more than 30 db, the normal sleep will be disturbed. But according to the World Health Organization in the newly released an investigation report that the United States has become increasingly serious problem of noise pollution in the United States, living in 85 decibels above the noise pollution of the environment in the number of people 20 to increase by several times. While continuing to live in 70 dB above the noise environment, human health and the hearing will be affected. Noise and pollution in China is a big country, the car's engine sound, braking sound, burglar-alarm sound; builder roar of the machinery; the market sell voice, dance halls all night singing voice more often affect our lives and work. How to control the noise? Lin create noise, noise pollution will be removed from the urban serious enterprise.