GB/T 41175-2021视力障碍者和视听障碍者用辅助器具行人交通信号灯的声音和触觉信号标准
英文:Assistive products for persons with vision impairments and persons with vision and hearing impairments—Acoustic and t...
英文:Assistive products for persons with vision impairments and persons with vision and hearing impairments—Acoustic and t...