1. Excavator idaha ojiji 1, Earthwork: Excavators nwere ike ji mee ihe n'ihi na ụwa mmepe, n'ala larịị, roadbed ogwugwu, olulu backfilling na ndị ọzọ ọrụ.Ọnọdụ ihe owuwu nke ụwa dị mgbagwoju anya, ọtụtụ n'ime ha bụ ọrụ ikuku, nke ihu igwe, hydrology, geology na-emetụta, ma sie ike ịchọpụta ...
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