Feem ntau hais lus, kev khawb av yog lub qhov hauv av vim yog tshem cov khoom. Lub trench yog ib qho kev khawb hauv qhov tob tshaj (yog loj dua) qhov dav.
Puas yog lub trench dav dua qhov kev khawb?
Raws li OSHA, kev khawb av tau txhais tias "txhua tus neeg tsim kev txiav, kab noj hniav, trench, lossis kev nyuaj siab nyob rau hauv lub ntiaj teb saum npoo tsim los ntawm lub ntiaj teb tshem tawm." Ntawm qhov tod tes, lub trench txhais tau tias yog "qhov kev khawb hauv av nqaim uas tob dua li qhov dav, thiab yog tsis dav dua 15 ko taw(4.5 meters). "
Lub hom phiaj ntawm kev khawb av yog dab tsi?
Kev khawb av yog ua tiav rau tso cai rau kev teeb tsa lossis kho cov khoom siv pej xeem, cov kav dej thiab cov kav dej los ua haujlwm rau thaj chaw muaj neeg nyob.
Dab tsi yog qhov sib txawv ntawm kev khawb thiab khawb?
As nouns the txawv ntawm excavation and dig
is that excavation is (uncountable) the act of excavating, or of making hollow, by cutting, scooping, los yog khawb tawm ib feem ntawm cov khoom loj thaum khawb yog kev tshawb nrhiav archaeological.
Dab tsi yog khawb hauv kev khawb?
Kev khawb, tseem hu ua excavation, yog txheej txheem ntawm kev siv qee qhov kev siv xws li claws, tes, phau ntawv cov cuab yeej lossis cov cuab yeej hnyav, tshem tawm cov khoom los ntawm cov khoom tawv, feem ntau yog av lossis xuab zeb ntawm lub ntiaj teb.
