The earphones for air conduction and bone conduction testing were TDH-39P and Radioear B-71 models, which accorded with GB/T 4851.1 and GB/T 485 4.3 criteria after adjustment. The impedances of electrode were all less than 5 k ?是什么意思_The earphones for air conduction and bone conduction testing were TDH-39P and Radioear B-71 models, which accorded with GB/T 4851.1 and GB/T 485 4.3 criteria after adjustment. The impedances of electrode were all less than 5 k ?在线翻译_英语_读音_用法_例句