1. Ozugbo arụ ọrụ nchekwa ngwaike na-arụ ọrụ, ọ ga-eme nyocha onwe onye na-ezighị ezi kwa nkeji iji dobe igwe ahụ na ọnọdụ ọrụ nkịtị.
2. Nkwado ngwa ngwa nkwalite ọrụ.
3. Ezi nnyonye anya mgbochi elektrọnik (dị ka ebili mmiri redio, ọkụ eletrik, arcs, wdg).

2022.03.04