Cov tshuab luam ntawv siv los ntawm lub tshuab POS yog txhua lub tshuab luam ntawv thermis.
Muaj 2 hom POS tshuab luam ntawv nrov. Ib tug yog ib rab koob-type tshuab luam ntawv. Nws tuaj yeem luam 3 daim pib me me ib zaug. Lub suab ntawm kev luam ntawv kuj loj heev. Feem ntau, cov qauv ntawv luam tawm rau ntawm qhov chaw luam ntawv kom txo tau qhov kev ua haujlwm ntawm lub tshuab luam ntawv cov khoom ua haujlwm. ; Lwm qhov yog lub tshuab luam ntawv thermis, qhov chaw luam ntawv yog dawb, thiab cov ntawv luam tawm yog cov ntawv dub thiab cov qauv. Lub suab ntawm kev luam ntawv me me heev.
