GB - Chinese national standards

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Electroacoustics—Measurement microphones—Part 2: Primary method for pressure calibration of laboratory standard microphones by the reciprocity technique

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Electroacoustics - Measurement microphone - Part 3: Primary method for free-field calibration of laboratory standard microphones by the reciprocity technique

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Measurement microphonesPart 4: Specifications for working standard microphones

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Electroacoustics—Measurement microphones—Part 5: Methods for pressure calibration of working standard microphones by comparison

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Electroacoustics—Measurement microphones—Part 6: Electrostatic actuators for determination of frequency response

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Electroacoustics—Measurement microphones—Part 7:Values for the difference between free-field and pressure sensitivity levels of laboratory standard microphones

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Electroacoustics—Measurement microphones—Part 8:Methods for determining the free-field sensitivity of working standard microphones by comparison

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Product of geographical indicationBaoqinghong adzuki bean

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Planed lumber

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