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GB/T 44808.3-2024_Chinese: Ergonomics - Accessible design - Part 3: Sound pressure levels of spoken announcements for products and public address systems (Chinese: 人类工效学 无障碍设计 第3部分：产品和公共广播系统语音播报的声压级) Note/Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working-hours typically, ASAP English versions: GB/T 44808.3-2024
