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關注：1
2013-05-23 12:21
求翻譯：Duct ends shall be provided with suitable conical wooden stoppers to prevent dirt from entering the ducts.是什么意思？ 待解決
 懸賞分：1
- 離問題結束還有
Duct ends shall be provided with suitable conical wooden stoppers to prevent dirt from entering the ducts.
問題補充： |
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