1.Perfect txheej nyhuv, me tshaj roughness, tsawg concave-convex.

2.Wtiv thaiv,damp-pov thawj, zoo nruj, temperature kuj, anti-erosion, zoo thaiv-tawm nyhuv.

3.Csib haum tus cwj mem ntawm cov xim thiab dye nrog cov xim zoo reducibility

1. Labeling thiab ntim hauv ntau yam lag luam, xws li khoom noj, tshuaj pleev ib ce, thiab tshuaj
2. Printing zoo graphics thiab ntawv
3. Eye-catching cov ntawv cim thiab cov ntawv nplaum