Cov khoom lag luam
PE sab nraud txheej
Cov txheej txheej sab nraud muaj lub zog siab thiab tawv. Nws yeej tsis tau piam, laus, tawg, ntxeem tau thiab tseem ib puag ncig- tiv thaiv thiab nplaim taws-retarded.
Cim npe nrov: Tooj liab kab teeb tau cov yeeb nkab tov, Tuam Tshoj tooj liab kab txheej txheem kab yeeb yam yeeb nkab tuam txhab manufacturers, lwm tus neeg, Hoobkas