Marine Hlau Manhole Hatch npog rau Nkoj Lem
Manhole npog lossis kho lub qhov taub npog yog tshem tau cov phaj tsim txoj kab lub hau qhib qhov qhib ntawm qhov manhole, qhov qhib loj txaus rau tus neeg dhau los uas tau siv los ua qhov chaw nkag rau lub vov tsev lossis cov yeeb nkab. Nws yog tsim los tiv thaiv ib tus neeg lossis ib yam dab tsi kom tsis poob rau hauv, thiab khaws cov neeg uas tsis tau tso cai thiab khoom siv.
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