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關(guān)注：1
2013-05-23 12:21
求翻譯：The trickling filter was packed with 60 litres of blast furnace slag, size 4 to 6 cm. This is a是什么意思？ 待解決
 懸賞分：1
- 離問題結(jié)束還有
The trickling filter was packed with 60 litres of blast furnace slag, size 4 to 6 cm. This is a
問題補(bǔ)充： |
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