Kusho ukuthini u-A no-B enombolweni yochungechunge?

Kunezinhlobo ezimbili zochungechunge lwe-A kanye ne-B enombolweni yochungechunge. Uchungechunge lwe-A luyincazelo yosayizi evumelana nezindinganiso zochungechunge lwaseMelika: uchungechunge lwe-B luyincazelo yosayizi ehlangabezana nezindinganiso zochungechunge lwaseYurophu (ikakhulukazi i-UK). Ngaphandle kwephimbo elifanayo, zinezici zazo kwezinye izici. Umehluko omkhulu yile:
1) Ubukhulu bepuleti leketanga langaphakathi kanye nepuleti leketanga langaphandle lemikhiqizo yochungechunge lwe-A buyalingana, futhi umphumela wamandla alinganayo wamandla aqinile utholakala ngokulungiswa okuhlukile. Ipuleti leketanga langaphakathi kanye nepuleti leketanga langaphandle lemikhiqizo yochungechunge lwe-B kulungiswa ukuze kulingane, futhi umphumela wamandla alinganayo wamandla aqinile utholakala nge-Baidu ehlukene.
2) Ubukhulu obuyinhloko bengxenye ngayinye yochungechunge lwe-A bunesilinganiso esithile sephimbo. Njenge: ububanzi bephini = (5/16) P, ububanzi be-roller = (5/8) P, ubukhulu bepuleti leketanga = (1/8) P (P yiphimbo leketanga), njll. Kodwa-ke, akukho silinganiso esicacile phakathi kobukhulu obuyinhloko kanye nephimbo lezingxenye zechungechunge lwe-B.
3) Uma kuqhathaniswa inani lomthwalo wokuphuka kwamaketanga ebanga elifanayo, ngaphandle kokuthi imininingwane ye-12B yochungechunge lwe-B iphansi kuneyochungechunge lwe-A, ezinye izincazelo ziyafana nemikhiqizo yochungechunge lwe-A yebanga elifanayo.

Izinga lomkhiqizo lilingana nezinga lomhlaba wonke le-ISO9606:1994, futhi imininingwane yomkhiqizo wayo, usayizi kanye nenani lomthwalo wokudonsa kuhambisana ngokuphelele nezinga lomhlaba wonke.
Izici zesakhiwo: Iketanga lakhiwe ngamapuleti eketanga angaphakathi, ama-roller kanye nemikhono, ahlanganiswe ngokushintshana ngezixhumanisi zeketanga langaphandle, akhiwe ngamapuleti eketanga angaphandle kanye nemishayo yephini.
Ukuze kukhethwe umkhiqizo, incazelo yeketanga edingekayo ingakhethwa ngokuya ngejika lamandla. Uma ikhethiwe ngokuya ngokubala, isici sokuphepha kufanele sibe ngaphezu kuka-3.