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關注：1
2013-05-23 12:21
求翻譯：If oil is struck , a cover is firmly fixed to the top of the pipe and the oil is allowed to escape through a series of valves.是什么意思？ 待解決
 懸賞分：1
- 離問題結束還有
If oil is struck , a cover is firmly fixed to the top of the pipe and the oil is allowed to escape through a series of valves.
問題補充： |
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