Koj puas tau ntsib cov xwm txheej zoo li no: thaum lub sijhawm siv cov saw hoist, cov saw hoist yuav plam, qhov tseeb, ib qho ntawm cov laj thawj uas yuav ua rau cov saw hoist plam yog kev sib txhuam disk, yog vim li cas thiaj li yuav ua rau muaj kev sib txhuam. disk plam?Tom ntej no, kuv yuav qhia koj qee qhov laj thawj ...
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