The surface roughness increases first and then decreases as surface density increase.

表面粗糙度在两个系统中都是随著表面密度先升后降.

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Do not empty the paper surface density meter or reset to zero.

不给在纸张外面纯不满或不去不整密度计.

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Cortical porosity and micro canal surface density are different between 2 D calculation and 3 D measurement.

二维推算与三维模型直接测量得到的孔隙率、微管表面积密度不同.

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