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關注：1
2013-05-23 12:21
求翻譯：A vacuum of 18 IN-Hg minimum for 2 seconds without showing bubbles in a jar of oil through which the vacuum is pulled是什么意思？ 待解決
 懸賞分：1
- 離問題結(jié)束還有
A vacuum of 18 IN-Hg minimum for 2 seconds without showing bubbles in a jar of oil through which the vacuum is pulled
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