Amanqaku kunye nokukhetha ukongeza
-
Iimpawu kunye neenketho
Kukho iinxalenye ezahlukeneyo zengxowa yokupakisha, efana ne-valve yomoya, esetyenziswa ngokubanzi kwibhegi yekofu ukuze iqinisekise ukuba ikofu ngaphakathi ngaphakathi inokuthi "uphefumle". Umzekelo, uyilo oluqhelekileyo lomzimba womzimba womntu lusetyenziselwa izinto ezinzima. ukupakisha.