Acoustics - stationary audible warning devices used outdoors - field measurements for determination of sound emission quantities 声学.室外用的固定音响警报装置.确定声音发射量的现场测量
3.
Acoustics - stationary audible warning devices used outdoors - part 1 : field measurements for determination of sound emission quantities 声学户外用固定式听觉报警器第1部分:声发射量的现场测定
4.
Refrain from using any audible warning device to ward off pedestrians unless there is a genuine danger 任何人不得在道路上使用车辆上任何发声警报设备,除非是为向在道路上或附近的任何人发出危险警报。