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不完全佩戴在听者身上的助听设备
Hearing aid equipment not entirely worn on the listener
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驻极体传声器校准规范
Calibration Specification for Electret Microphones
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助听器测试仪校准规范
Calibration Specification for Hearing Aids Measurement Instruments
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电声器件型号命名方法
Type designation for electroacoustic devices
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通信电声器件与设备互连的优选配接值
The prefered matching values between communication electo-acoustic device and equipment
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ODK-1型抗噪声送话器详细规范
Detail specification of noise-cancelling transmitter for ODK-1
价格：￥0.00
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