Road traffic noise reducing devices - procedures for assessing long term performance - non - acoustical characteristics 道路交通噪音减少设备.长期性能评估过程.非声学特性
6.
Road traffic reducing devices - procedures for assessing long term performance - part 2 : non - acoustical characteristics 道路交通噪音降低设备.长期效能评估程序.第2部分:非声学特性
7.
Road traffic noise reducing devices - non - acoustic performance - part 2 : general safety and environmental requirements 道路交通噪音降低装置.非声学性能.第2部分:一般安全和环保要求