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1 gen 420 anni - 【南朝】 为了防止在烧制过程中气体和有害物质污损坯件， 工匠把坯件放在耐火泥制成的匣钵中 【南北朝】 出现以灌钢法制作的农具

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人教版高中历史|Chinese students' PEP SENIOR HIGH HISTORY TEXTBOOKS

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1 gen 420 anni
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~ 1606 years ago
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