A na-eji ọkpọkọ spral eme ihe n'ọtụtụ ebe na gas, mmanụ ala, ụlọ ọrụ kemịkalụ, ụlọ ọrụ ọkụ, ụlọ ọrụ kpo oku, ọkọnọ mmiri na ụlọ ọrụ drainage, uzuoku uzuoku, ọkpọkọ igwe ọkụ eletrik, ike thermal, mmiri na ndị ọzọ na-ebufe pipeline na piling, dredging, akwa akwa, steelstr...
GỤKWUO