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ປະຕູຮົ້ວເຫຼັກສາມາດສະຫນອງປ່ອງຢ້ຽມ, shutter, shutter ລະບາຍອາກາດ, ແລະອື່ນໆຕາມຄວາມຕ້ອງການ. ອີງຕາມການຕໍ່ຕ້ານໄຟທີ່ແຕກຕ່າງກັນຂອງປະຕູໄຟເຫຼັກ, ຄວາມຕ້ານທານໄຟຂອງພວກມັນສາມາດແບ່ງອອກເປັນສາມຊັ້ນ: A, B ແລະ C.

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