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關(guān)注：1
2013-05-23 12:21
求翻譯：Regular cleaning of the external surfaces of the valve is required in order to avoid dust deposits deeper than 5 mm.是什么意思？ 待解決
 懸賞分：1
- 離問題結(jié)束還有
Regular cleaning of the external surfaces of the valve is required in order to avoid dust deposits deeper than 5 mm.
問題補充： |
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