Cov qauv yooj yim ntawm riam - hu ua fuse

Ib rab riam - Hu rau fuse feem ntau muaj cov fuse, fuse tuav, thiab rwb thaiv tsev sab saud, thiab rwb thaiv tsev. Cov fuse phaj thiab cov fuse phaj yog lub ntsiab ntawm lub fuse, thaum lub sijhawm qis dua thiab sab saud yog qhov tseem ceeb. Lub thermal rwb thaiv tsev muab rwb thaiv tsev ua cua sov.