... 上循环管 Upper circulation pipe 外封板 Outer seal plate 内衬板 Lining board ...
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outer seal plate
外密封板
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The oven is made of thin steel sheets, fiberglass is inserted between the working chamber and outer plate of the oven as thermal insulation, there is a seal ring embedded in the door.
烘箱由薄钢板构成，工作室与箱体外壳间以玻璃纤维作保温材料、门面镶有密封圈。
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