单项选择题
A.盒式助听器B.耳背式助听器C.深耳道助听器D.受话器外置助听器E.开放式助听器
A.平均听力损失>90分贝B.平均听力损失81-90分贝C.平均听力损失41-60分贝D.平均听力损失61-80分贝
A.250Hz,500Hz,1000Hz,2000Hz,3000Hz,4000HzB.500Hz,1000Hz,2000Hz,3000Hz,4000Hz,250HzC.1000Hz,2000Hz,4000Hz,1000Hz,500Hz,250HzD.1000Hz,2000Hz,3000Hz,1000Hz,500Hz,250Hz
A.气导B.骨导C.UCLD.MCL
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