The surface of the syringe must be clear and pure; rough edge, burr, plastic stream, defect are not allowed.
注射器表面必须清洁无杂质，不得有毛边、毛刺、塑流、缺损等缺陷。
Centrifugal glass cotton can sound-absorbing reason not because the surface is rough, but because of the internal and external connected with tiny pore and holes.
离心玻璃棉能够吸声的原因不是由于表面粗糙，而是因为具有大量的内外连通的微小孔隙和孔洞。
This method not only ADAPTS to predicting the whole fractal dimension of rough surface, but also ADAPTS to estimating local fractal dimension.
这种方法比较简单而切实可行，不但适合于粗糙面整体分维的计算，更适合于局部分数维的计算。
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