Cov qauv yog lub teeb thiab yooj yim rau nruab, haum rau thaj tsam me me ntawm cov khoom sib kis.Qhov chaw nruab nrab ntawm ob lub qhov ntsia hlau yog zoo ib yam nrog qhov chaw nruab nrab ntawm lub rooj zaum square kab pheeb ces kaum qhov ntawm tib hom.
UCFL cov ntawv thov tseem ceeb: kev teeb tsa me me qhov sib txawv ntawm cov tshuab, cov menyuam conveyor, khoom noj khoom haus, tshuab tshuaj, thiab lwm yam.