测试研究了有代表性的14种不同材质、不同截面几何形状及尺寸大小的纤维材料；
The sound-absorbing coefficients of 14 typical fiber Materials with different geometrical cros-section forms and sizes are measured and studied.
该钻孔尺寸选定应提供足够有代表性的样本，剖析材料和参考。
The drill hole size selected should provide sufficient representative sample material for analysis and reference.
应用推荐