Lub hnab yas khw

Cov hnab ntim khoom yas yog cov hnab yas siv los ntawm cov neeg siv khoom los tuav cov khoom yuav khoom thiab muaj lub luag haujlwm nqa. Nws yog tsim los ntawm cov khoom siv raw khoom tseem ceeb, thiab siv rau hauv kev muag khoom, kev pabcuam thiab lwm qhov chaw rau cov khoom thiab lwm yam khoom, thiab yog siv los nqa cov khoom ntim khoom. Lub hnab yas luam ntawv yuav tsum muaj tus cwj mem tsis zoo, meej thiab ua tiav cov qauv thiab cov ntawv nyeem, kev luam tawm raug, qhov yuam kev overprinting yuav tsum tsawg dua 1 hli, thiab cov luam ntawv stripping yog tsawg dua 20%.