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ເວລາທົນໄຟຂອງປະຕູໄຟຊັ້ນ B ຄວນຈະບໍ່ຫນ້ອຍກວ່າ 1.0 ຊົ່ວໂມງ, ແລະອຸປະກອນເສີມຮາດແວທີ່ໃຊ້ໃນປະຕູໄຟຕ້ອງໃຊ້ອຸປະກອນເສີມຮາດແວ refractory. ປົກກະຕິແລ້ວຊັ້ນຂອງປະຕູໄຟນີ້ແມ່ນຖືກນໍາໃຊ້ໂດຍທົ່ວໄປສໍາລັບປະຕູຕົບແຕ່ງຄອບຄົວ.

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