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.
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.
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