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關注：1
2013-05-23 12:21
求翻譯：this usually involves the use of a radioactive source within the mould wall to measure the absorption of gamma rays due to the presence of liquidsteel.是什么意思？ 待解決
 懸賞分：1
- 離問題結束還有
this usually involves the use of a radioactive source within the mould wall to measure the absorption of gamma rays due to the presence of liquidsteel.
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