Nyob rau hauv xyoo tas los no, cov ntawv tsis muaj carbonless ib leeg ib sab tau dhau los ua kev xaiv ntawm ntau lub tuam txhab thaum lawv xav tau luam tawm. Lawv tsis tsuas yog them sai sai rau qhov zoo ntawm daim ntawv, tab sis kuj xyuam xim rau tus nqi. Txawm li cas los xij, muaj ntau lub tuam txhab ntawm carbonless luam ntawv hauv khw. Yuav ua li cas yog ib tug txhim khu kev qha carbonless luam ntawv? Yuav xaiv dab tsi?
Rau cov nqi ntawm cov ntawv tsis muaj carbonless, nws yog ib qho yooj yim los sib piv qhov siab thiab qis, thiab nws yooj yim rau cov neeg siv khoom kom paub qhov txawv ntawm qhov siab thiab qhov tsawg. Peb yuav tsis mus rau hauv cov ntsiab lus ntawm no. Niaj hnub no, cov neeg ua haujlwm xav muab koj ib qho kev tshuaj xyuas tshwj xeeb ntawm qhov zoo ntawm carbonless luam ntawv.
Ua ntej, saib kev luam ntawv. Cov ntawv zoo carbonless luam ntawv feem ntau luam tawm cov ntawv zoo thiab meej. Tau kawg, cov tuam txhab sib txawv muaj lawv tus kheej cov qauv thaum yuav daim ntawv. Txhua tus neeg yuav tsum xaiv cov ntawv tsis muaj carbonless nrog cov luam ntawv meej thiab zoo dua raws li lawv tus kheej cov qauv.
Qhov thib ob, saib daim npog. Vim tias carbonless luam ntawv feem ntau yog phau ntawv los ntawm phau ntawv, thiab lub sijhawm siv ntawm txhua phau ntawv yog qhov ntev, tsuas yog lub hau npog muaj qhov muag muag thiab tiv taus tig thiab hnav, thiaj li tiv thaiv cov ntaub ntawv huv thiab siv mus ntev.
Tsis tas li ntawd, nws raug nquahu kom koj sim luam cov qauv ua ntej. Kev ntseeg siab ntawm cov ntawv tsis muaj carbonless yog feem ntau du thiab yooj yim sau, thiab cov ntawv sau tau meej thiab yuav tsis xau tawm.