Method: In an environment of 50 ± 3dB ( SPL, A) background noise, with the audiometer developed by the authors, and an electric otoscope, the hearing of 195 infants aged 38& 93 days in Beijing area were examined.

  • 方法:在背景噪声为50±3dB(SPL,A)环境,使用作者自行研制的BA-33型听力筛查仪和电耳镜对195名北京市区38-93天的婴儿进行检查。

  • 互联网摘选 2025-01-19 23:22:32

    • 相关例句
    精确
    • 模糊
    • 词首
    • 词尾
    • 词义
    • 例句