Thaum lub qhov rooj hluav taws kub qhib, nws tsuas yog xav tau 1 KG quab yuam, thiab qhov qhib qhov nro tsawg dua 50N, txawm tias cov neeg nyob hauv lub rooj zaum muaj log tuaj yeem qhib tau yooj yim. Lub qhov rooj tuav txoj haujlwm yog tib neeg, txawm tias cov neeg laus lossis menyuam yaus tuaj yeem yooj yim thawb thiab rub, ua rau kev siv yooj yim dua thiab xis nyob.

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