Hard leads Harder mem hluav coj pib nrog 2H, uas yog qhov sib npaug ntawm tus lej 4 ntawm US Numbering system, ua raws li qhov nyuaj 3H, 4H thiab lwm yam.
Qhov twg yog qhov nyuaj B lossis HB?
Qib ntawm graphite hardness yog txiav txim siab los ntawm qhov sib xyaw ntawm graphite thiab av nplaum, qhov ntau dua cov graphite softer cov hmoov txhuas thiab av nplaum ntau dua cov hmoov txhuas… Graphite Cov cwj mem raug cais raws li cov xim dub (B), tawv (H), tawv dub (HB), thiab ruaj (F).
Cov hlau lead twg yog softer HB lossis 2B?
Tus lej
B ntawm nws tus kheej tsuas yog me ntsis softer dua HB. 2B, 3B thiab 4B yog qhov muag muag. Ntxiv rau qhov ntau, 9Byog cov hmoov txhuas softest muaj, tab sis yog li mos thiab crumbly uas nws tsis tshua siv.
Qhov twg tsaus 2B lossis HB?
2B cwj mem muaj qhov dub dua, thiab cov cim kos yog xim dub, thaum HB mem hluav muaj qis dua, thiab xim ntawm cov cim kos yog qhov sib txawv, uas txawv heev. Kev siv 2B mem hluav thiab HB mem hluav kuj txawv heev. 2B xaum yog xim tsaus thiab qis dua hauv qhov tawv
Puas yog 0.5 lossis 0.7 lead zoo dua?
Cov 0.7mm ua rau tuab dua, uas yog qhov zoo dua rau cov neeg uas nyiam nias nyuaj ntawm xaum thaum sau ntawv. Rau kev kos duab, siv 0.5mm leads, vim lawv muaj tseeb dua li 0.7mm leads.
