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GB/T 30117.4-2023 Chinese PDF (GB/T30117.4-2023)

GB/T 30117.4-2023 Chinese PDF (GB/T30117.4-2023)

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GB/T 30117.4-2023_Chinese: Photobiological safety of lamps and lamp systems - Part 4: Measuring methods (Chinese: 灯和灯系统的光生物安全 第4部分：测量方法)
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English versions: GB/T 30117.4-2023
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