Xav txog kev nyab xeeb kev ua haujlwm ntawm lub thoob of elevator, peb tsim cov khoom siv rov qab nres ntawm cov khoom siv. Qee lub cev muaj zog nrog cov khoom siv rov qab, thaum lwm lub cev muaj zog tsis muaj cov cuab yeej zoo li no .Tom qab ntawd peb tuaj yeem sib sau ua ke ib qho khoom siv rov qab nres .Cov khoom siv rov qab nres yog nrog cov compressive thiab av qeeg-resistant, uas ua kom lub thoob of elevator tuaj yeem ua haujlwm zoo.Cov qauv ntawm nraub qaum Cov cuab yeej nres yog khoom, kev saib xyuas me ntsis.Nws yog ua los ntawm cov khoom tshwj xeeb los tiv thaiv abrasive, yog li nws tuaj yeem siv tau ntev. Muaj lub qhov rooj tshuaj xyuas thiab caesarean seem taub hau rau saum lub thoob of elevator. Qhov kev tsim no tuaj yeem ua rau nws yooj yim los ntxuav thiab tu. Nws yog qhov hloov tau yooj yim dua los ua kev xaiv ntawm cov khoom siv thiab kev kho deg.
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