Siv ntawv tej tshuab teeb meem

Siv lub tshuab tej ntawv yog qhov khoom ntawm ib txhis heev, loj heev tes dej num nyob hauv cov ntawv ua kev lag luam. Ntawm qhov earliest txhua yam rau cov kev tswj qhov kev pab cuam ntawv cutter, ntawv luam ntawv tom qab ntawd yog qhov ntau ntau. Thaum Nimno muaj ntau ntau tej cav tov, xws li kev tswj ntawv tshuab, ntawv tej tshuab, cov zaub ntawv tej tshuab... Thiab hais ntau yam.
Nyob rau kev siv cov ntawv tej tshuab, peb yuav tsum xyuam xim rau cov teeb meem nram qab no:
1. daim ntawv txiav yuav txiav ntawv, yuav muab txiav ntau yam khoom, xws li tawv thiab yas, thiab li ntawm, ces thaum koj siv tej tshuab-tej uas muaj ntaub ntawv ntau ntawv, peb yuav tsum xyaum ib siab sib txawv, thiab cov hniav cutter, xyuas kom meej tias tej qhov ntawm qhov khoom ntawd kom zoo siab.
2. cutter hniav sharpness tseem ceeb heev, ib tug zoo ntawv npog cia kom muaj cov sharpness ntawm cov hniav, kom nws tau muaj lav efficiency.
3. them rau cov kev tu ncua hauv kev loj hlob ntawm science thiab xob tshuab tshiab thiab lub neej, siv lub tshuab tej ntawv yuav hlais ib yam ntawm cov ntaub ntawv, suab siab mechanism yuav zoo lis ntaub ntawv yuav tsis txhim kho qhov teeb meem.