Kukho iindidi ezimbini zeengcango zeglasi ezingatshiyo, intsimbi kunye nentsimbi engatyiwayo. Insimbi engenasici ithandwa kakhulu kwiimarike, inemibala eyahlukeneyo. Ixesha lokumelana nomlilo weKlasi A, B kunye neC iingcango zeglasi ezingenakuvutha umlilo ziiyure ze-1.5, i-1 iyure kunye neeyure ze-0.5 ngokulandelanayo.

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