Tso siab rau kev xaiv thoob ntiaj teb rau kev kos cim tseem ceeb thiab kev sau txhua hnub nrog kos duab 2b cwj mem, thoob ntiaj teb lees paub tus qauv rau kev ntsuas tus qauv thiab kev ua haujlwm tau zoo. Txoj cai rau kev kuaj pom qhov muag pom (OMR) thoob ntiaj teb, nws cov tub ntxhais kawm tau zoo tshaj plaws los ua qhov tsaus ntuj, pom meej meej pom tau yooj yim los ntawm scanners, thaum nws cov tawv tawv tawv tiv thaiv kev hnav ntau dhau los yog snapping thaum rov ua dua ntawm cov lus teb npuas. Dhau li ntawm chav kuaj mob, cov khoom lag luam xa cov kev sau ntawv zoo tshaj plaws nrog tsuas yog kov cov lus tawm tswv yim zoo, tsim cov kab pom tseeb uas yooj yim rau kev tshem tawm tag nrho, ua rau nws muaj ntau yam hauv paus rau cov tub ntxhais kawm, cov kws tshaj lij, thiab cov kws kos duab pib lawv cov duab kos.
Qhov zoo sib xws ntawm qhov siab -zoo kos duab 2b cwj mem yog los ntawm kev siv cov purified, impurity-dawb graphite, kom ntseeg tau tias uniform, grain- cov kab dawb uas yuav tsis khawb daim ntawv. Qhov kev ntseeg siab no ua rau nws zoo meej rau kev sau ntawv ntev ntev - noj sijhawm, xyaum sau ntawv, sau cov ntaub ntawv, lossis ib txoj haujlwm uas xav tau cov cuab yeej siv tau ntev thiab kwv yees. Nws qhov xwm txheej sib npaug muab qhov kev ntseeg siab hauv nruab nrab- tsaus nti thiab du dua li H mem hluav, tsis tau huv thiab tswj tau ntau dua li qib B softer. Thaum koj xav tau ib tus cwj mem uas muaj peev xwm ua kom ntseeg tau ntau yam haujlwm, los ntawm kev xeem mus rau kev sau ntawv mus rau kev tsim cov duab kos ua ntej, cov khoom muag yog ib qho tseem ceeb thiab cov cuab yeej tseem ceeb.
Ua raws li kev ntseeg siab uas los nrog kev siv lub sijhawm - ntsuas, lees paub thoob ntiaj teb. Txawm hais tias ntsib qhov kev xeem tseem ceeb lossis kev ua haujlwm txhua hnub, muab koj tus kheej nrog rau cov cwj mem uas paub txog nws qhov kev ua tau zoo thiab kev yoog raws. Xaiv tus qauv ntawm kev cia siab. Ua tus kos duab 2b cwj mem koj thawj qhov kev xaiv thiab txhim khu kev qha tshaj plaws rau txhua qhov kev xav tau kev sau ntawv thiab lub hauv paus, qhov kev ua pov thawj tseem ceeb tshaj plaws.
Cim npe nrov: Drawing 2b mem hluav, Suav teb kos 2b mem hluav manufacturers, lwm tus neeg, Hoobkas
