Ntxiv rau qhov ua haujlwm ntawm cov qhov rooj zoo tib yam, cov qhov rooj hluav taws kuj muaj cov haujlwm tshwj xeeb ntawm kev tiv thaiv hluav taws, kev sib cais cov pa luam yeeb, hluav taws kub thiab tiv thaiv kev khiav tawm. Lub qhov rooj hluav taws tsuas tuaj yeem ua tau raws li qhov yuav tsum tau ua ntawm hluav taws kev ncaj ncees nyob rau hauv lub sijhawm hluav taws kub tiv thaiv, thiab qhov hluav taws kub siab yog 1.0h, 1.5h, 2.0h thiab 3.0h raws li.

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