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Grain with several with several son and hole of material is from the atom dimensions arrive the crystal grain is inside size scope all performance cent form characteristic.(The cent form characteristic of the characteristic-fractal)
Because its hole distribute and the random of the size, this literary grace use a random function method to carry on digging bore to the material.

The material granule geometry and the hole geometry display the minuteshape characteristic from the atomic criterion to the crystal grainsize scope in. (Minute shape characteristic - fractal characteristic) As a result of its porosity distribution and size randomness,this article uses the stochastic function law to carry on to thematerial digs the hole.

The particle and pore geometry from the atomic-scale geometry of the size range of display fractal characteristics. (Fractal characteristics -- fractal characteristic) because of its pore size distribution and Randomness, the paper random funct