重点讨论了常用一维管状光声腔体的光声理论，并给出了数学模拟模型。
This work focuses on the one-dimension PA cell and has given the model simulation of it.
研究了基于全反射消光原理测量管状透明体壁厚的原理和方法。
The principle and method for measuring the wall thickness of transparent tube are presented.
软签名花边管状拥有一个宽底部带弹力花边，光支持。
Soft signature lace bandeau boasts a wide bottom band of stretch lace for light support.
软签名花边管状拥有一个宽底部带弹力花边，光支持。
Soft signature lace bandeau boasts a wide bottom band of stretch lace for light support.
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