Kuthetha ukuthini u-A no-B kwinombolo yetsheyini?

Kukho uthotho olubini luka-A no-B kwinombolo yetshaneli. Uthotho luka-A luluhlu lobungakanani oluhambelana nomgangatho wetshaneli yaseMelika: uthotho luka-B luluhlu lobungakanani oluhlangabezana nomgangatho wetshaneli yaseYurophu (ikakhulukazi i-UK). Ngaphandle kwepitch efanayo, zineempawu zazo kwezinye iinkalo. Umahluko ophambili zezi:
1) Ubukhulu bepleyiti yetyathanga yangaphakathi kunye nepleyiti yetyathanga yangaphandle yeemveliso zothotho lwe-A bulingana, kwaye isiphumo samandla alinganayo samandla azinzileyo sifunyanwa ngohlengahlengiso olwahlukeneyo. Ipleyiti yetyathanga yangaphakathi kunye nepleyiti yetyathanga yangaphandle yeemveliso zothotho lwe-B zilungiswa ukuze zilingane, kwaye isiphumo samandla alinganayo samandla azinzileyo sifunyanwa ngeBaidu eyahlukileyo.
2) Ubukhulu obuphambili becandelo ngalinye lothotho lwe-A bunomlinganiselo othile kwipitch. Ezifana nezi: ububanzi bephini = (5/16) P, ububanzi berola = (5/8) P, ubukhulu bepleyiti yetsheyini = (1/8) P (P yipitch yetsheyini), njl. Nangona kunjalo, akukho mlinganiselo ucacileyo phakathi kobukhulu obuphambili kunye nepitch yeenxalenye ze-B series.
3) Ukuthelekisa ixabiso lomthwalo oqhekekayo weetsheyini zebakala elifanayo, ngaphandle kokuba iinkcukacha ze-12B zechungechunge lwe-B ziphantsi kunezo zechungechunge lwe-A, ezinye iinkcukacha ziyafana neemveliso zechungechunge lwe-A zebakala elifanayo.

Umgangatho wemveliso ulingana nomgangatho wehlabathi we-ISO9606:1994, kwaye iinkcukacha zemveliso yayo, ubungakanani kunye nexabiso lomthwalo wokutsalwa zihambelana ngokupheleleyo nomgangatho wehlabathi.
Iimpawu zesakhiwo: Itsheyini yenziwe ngeepleyiti zetsheyini zangaphakathi, iirola kunye nemikhono, ezixhonywe ngokutshintshiselana ngeekhonkco zetsheyini zangaphandle, ezenziwe ngeepleyiti zetsheyini zangaphandle kunye nee-pin shafts.
Xa kukhethwa imveliso, iinkcukacha zetsheyini ezifunekayo zingakhethwa ngokwendlela yamandla. Ukuba zikhethwe ngokwendlela yokubala, umlinganiselo wokhuseleko kufuneka ube ngaphezulu kwe-3.