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pitlord999
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2Â¥2009-09-16 20:32:20
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| Although approximately 25 percent compositions of organic compounds are known, the majority chemical structures and their processes, as well as their control approach and technologies are not clear yet. |

3Â¥2009-09-16 23:10:11
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4Â¥2009-09-17 08:04:43














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