ຂັ້ນໄດຂັ້ນໄດມີຂະໜາດຕັ້ງແຕ່ 4 ຫາ 20 ຟຸດ ຍາວຕາມທາງຂ້າງ, ໃນຂະນະທີ່ຂັ້ນຕ່ຳກວ່າ 4 ຟຸດຖືກພິຈາລະນາ.ຂັ້ນຕອນອາຈົມ. Regardless of size, all step ladders and stools should follow the same strict guidelines to meet safety standards. ຂັ້ນໄດຂັ້ນໄດ ແລະຂັ້ນຕອນອາຈົມມີຄຸນສົມບັດແລະອຸປະກອນເສີມທີ່ແຕກຕ່າງກັນ.
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