降低通气孔口径 延长耳道内耳模（earmold）的深度 更换耳模管子（tubing）为更细内径 逐渐增加声孔（sound bore）的口径 66 使用耦合器（coupler）换算助听器增益与实耳配戴增益（REAG）的差異，下列何项說明不正确？
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A slender woodwind instrument with a conical bore and a double reed mouthpiece, having a range of three octaves and a penetrating, poignant sound.
带有一个圆锥形孔和双簧管吹口的细小的木管乐器，具有三个八度音域和穿透力强而尖利的声音。
The envelope of sound spectrum is related to the transfer function of bore.
声频谱包络的特点和音管的传递函数有相应的关系。
In this paper, the actuality of concrete detection, several working modes and theories of bore sound wave methods, and their application in engineering are introduced.
本文主要介绍了混凝土质量检测的现状，钻孔声波法的几种工作模式、原理以及在工程中的实际应用。
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