Daj cowhide, tseem hu ua Class A tawv tawv, yog cov khoom siv uas siv dav siv hauv txhua lub rooj zaum tawv tsheb. Qhov saum npoo yog muag heev thiab mos, nrog yuav luag tsis muaj qhov hws tau pom. Cov ntawv sau yog muaj zog thiab tawv heev, yog li lub rooj zaum ua haujlwm Zoo nkauj.
Twm twm tawv kuj tseem hu ua chav kawm tawv B. Piv nrog tawv daj, qhov zoo dua yog tias nws muaj zog thiab hnav-resistant. Qhov tsis zoo yog tias nws tsis mos muag txaus, hnov zoo tsis txaus, muaj qhov tawv tsis zoo, ntxhib ntxi, thiab ntxi tawv zoo nkauj. Piv nrog tawv daj, txoj kev ua tiav cov txheej txheem muaj qhov txawv me ntsis dua.
Ntxiv rau qhov saum toj no ob hom tawv, C-qib tawv yog feem ntau pom ntawm kev ua lag luam, uas yog, ob-txheej tawv ntawm nyuj thiab twm.
Qib C tawv, piv nrog Qib A tawv thiab Qhab B tawv, nws txawv ntau hauv qhov zoo, zoo nkauj, nqe thiab kev pab lub neej. Yog li, nws tsis pom zoo kom cov neeg siv khoom lag luam ua rooj zaum qis dua Chav Kawm B.
Raws li ib txwm mob, rooj zaum ua los ntawm A-tawv tawv thiab B-qib tawv feem ntau siv tau ntau dua 5 txog 8 xyoo. Uas yog hais, nyob rau hauv Suav teb, txawm hais tias lub tsheb raug rho tawm lossis rov ua dua tshiab, tawv rooj yuav tuaj yeem siv. Khaws kom zoo.
Qhov zoo ntawm C-qib tawv tawv yog tias nws pheej yig, tab sis kev pab cuam lub neej luv. Nws tsis nquahu rau cov neeg yuav khoom xaiv cov tawv C-qib.
Txawm hais tias nws zoo lossis tawv nqaij qis, qhov tseem ceeb yog tswj. Yog tias kev saib xyuas txhua hnub tsis raug, lub neej kev pab tsuas yog ib lossis ob xyoos xwb. Vim li no, nws raug nquahu kom tswj xyuas nws ib hlis ib zaug thiab ntxuav nws ib zaug hauv peb lub hlis.
