1. Excavator si nmu ti lilo 1, Earthwork: Excavators le ṣee lo fun aiye idagbasoke, ilẹ ipele, roadbed excavation, ọfin backfilling ati awọn miiran ise.Awọn ipo ikole ilẹ jẹ eka, ati pe pupọ julọ wọn jẹ iṣẹ afẹfẹ, ti o ni ipa nipasẹ oju-ọjọ, hydrology, Geology, ati pe o nira lati pinnu ...
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