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2Â¥: Originally posted by fuyuandj86 at 2015-07-03 00:39:57
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ÐÄËØÈç¼ò1991

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3Â¥: Originally posted by calorimetry at 2015-07-03 09:05:23
PEI£º¾ÛÒÒÏ©Ñǰ·£¨Polyethylenimine£©

http://www.baike.com/wiki/ULTEM

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