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The most likely candidates for the centers are bubbles filled with oxygen gas, which may be formed either by reboiling the oxygen gas dissolved in the melt or by directly converting oxygen ions in the feeding rod to oxygen gas during the melting process that remain in the melt as bubbles.

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sirljz(½ð±Ò+2):лл½»Á÷ 2010-04-14 17:42
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resonant

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lidanye

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ll921(½ð±Ò+10, ·­ÒëEPI+1): 2010-04-14 15:18
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jiujieshan

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