Uhlolo lomgangatho apho iimpahla ezigqityiweyo nezipakishiweyo zijongwa ngeesampulu phambi kokuthunyelwa.
[01]
Uhlolo phambi kokuthunyelwa lwenziwa emva kokuba imveliso igqityiwe kwaye uninzi lweempahla lupakishiwe, phambi kokuba zishiye ifektri. Iisampulu zihlala zikhethwa ngokungacwangciswanga kusetyenziswa indlela ye-AQL.
Ludla ngokuquka ubungakanani, inkangeleko nobuchule bomsebenzi, imilinganiselo, iimvavanyo zokusebenza, iilebhile nokupakisha. Ngokuxhomekeke kwisiphumo, iimpahla ziyathunyelwa, kucelwa ukuba zilungiswe kwakhona okanye kucwangciswe uhlolo olutsha.