吸声

The results show that the influences of various backings on the acoustic characteristics of anechoic coating are obviously different.

结果表明，不同背衬对覆盖层性能影响具有明显不同特性。

And then on to Katherine,sitting desolately,no sign of life except for her shallow breathing.

然后去凯瑟琳屋，她垂头丧气地坐着，除了浅弱，有一点生机。

According to acoustic structure theory base,acoustic principle of multi-holes acoustextile and nonwovens characteristics,nonwovens acoustic theory are analysed in the paper.

根据结构理论基础以及多孔材料机理,结合非织造布结构特点,系统分析了非织造布原理。