China National Standards

China Expression physical subjective GB Standards List

  •  China "Expression physical subjective" GB Standards List:
    • Standard  Code Standard Title Standard Class Order
    GB/T 3239-1982 Expression of physical and subjective magnitudes of sound and noise in air
    空气中声和噪声强弱的主观和客观表示法    		 China National Standards
    Expression physical subjective
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