Taw qhia ntawm theem hluav taws xob rwb thaiv tsev
Kev ntsuas qhov theem ntawm lub cev muaj zog yog hais txog cov txheej txheem thaum tshav kub kub ntawm cov txheej txheem rwb thaiv tsev siv, uas tau muab faib ua A Qib, E Qib, B Qib, F Qib, H Qib, C Qib, N Qib, thiab R qib. Kev tso cai kom sov nce siab yog hais txog qhov txwv uas qhov ntsuas kub ntawm lub cev muaj zog nce piv nrog qhov ntsuas kub nyab xeeb. Kev faib tawm ntawm qib rwb thaiv tsev lub cev yog ua raws li cov khoom pom zoo tso cai ntsuas kub ntawm cov khoom siv rwb thaiv tsev los ntawm lub cev muaj zog. Muaj ntau qib xws li Y, A, E, B, F, H, thiab C.