Hauv lub sijhawm, muaj ib yam dabtsi tseem ceeb dua. Muaj ib lub sijhawm uas tshwb tswv uas nrhiav tau nrhiav tau 6kW lub caij. Lawv nrhiav tau nrhiav phau nrhiav nrhiav phau, ( Chiv Keeb 3: 1 - 5) Yog li ntawd, peb yuav tsum siv ntsib nrhiav li cas. A 6