| 1. | Sound insulation and noise reduction for buildings - code of practice
建筑物的隔音和噪声降低.实施规范 |
| 2. | Hearing protectors - safety requirements and testing - active noise reduction ear - muffs
护听器.安全要求和试验.有源噪声降低型耳套 |
| 3. | Aircraft ground support equipment - general requirements - noise measurement methods and reduction
飞行器地面支持设备.一般要求.噪声测量方法和噪声降低 |
| 4. | Road traffic noise reducing devices - non - acoustic performance - general safety and environmental requirements
道路交通噪声降低设备.非声学性能.一般安全和环境要求 |
| 5. | Aircraft ground support equipment - general requirements - part 4 : noise measurement methods and reduction
飞行器地面支持设备.一般要求.第4部分:噪声测量方法和噪声降低 |
| 6. | Road traffic noise reducing devices - test method for determining the acoustic performance - part 4 : intrinsic characteristics - in - situ values of sound diffraction ; german version cen ts 1793 - 4 : 2003
道路交通噪声降低装置.声学性能测定的试验方法.第4部 |
| 7. | This series motors are widely used in various mechanical equipment which needs stepped speed adjustment , so that they enable the equipment to have compact structure , lower noise and ability to save energy
本系列电动广泛用于各类需要有级调速的机械设备，能使整机结构紧凑、噪声降低、能量节约。 |
| 8. | On the cutting conditions without spraying water damping , the cutting noise of damping diamond saw blade is 86 . 69db , it is 17 . 81db smaller than it of ordinary diamond saw blade , which conforms with requirement of industry hygiene standard ( 90db )
通过现场切割噪音测试，在干切的条件下，该消音结构的金刚石锯片切割噪声为86 . 69db ，而普通金刚石锯片的噪声为104 . 5db ，比普通锯片的噪声降低了17 . 81db 。 |
