Thaum lub sij hawm ua hauj lwm ntawm lub thoob of elevator, cov thoob yog nqa cov hmoov hauv qab thiab cov ntaub ntawv raws li qhov ceev ceev. Nyob rau hauv cov txheej txheem ntawm kev lag luam, thoob yog ib txwm nias nrog mining hmoov thiab cov ntaub ntawv, tej zaum nws yuav nyem lub plhaub.In thiaj li yuav xyuas kom meej tag nrho cov thoob yog noj tsis tu ncua, yuav tsum muaj siab cov ntaub ntawv txheej los yog hmoov txheej. Yog li, nws muaj peev xwm xyuas kom meej tsav ncej. yog ib txwm faus rau hauv cov hmoov los yog cov ntaub ntawv. Mineral hmoov thiab cov ntaub ntawv yog ntws mus rau hauv lub caj pas lub thawv nyob rau hauv ib tug nruam txoj kev. Xav txog lub caj pas ntim khoom yog raws li ib qho tshwj xeeb quab yuam kom ruaj khov ntawm qhov chaw thiab xyuas kom nws ruaj khov, nws yuav ua rau lub caj dab hnav tawm sai sai, thiaj li ua rau qhov sib txawv ntawm cov ncej thiab lub caj pas.
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