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JamesZu
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11Â¥2013-05-05 19:20:20
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2Â¥2013-05-04 16:10:51
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¶þÂȼ×Íé Õâ¸öÊÇÀý×Ó£º This article is a study of methylene chloride as a substitute for trichloro-fluoromethane in producing flexible polyurethane foam. ÌÖÂÛÁËÓöþÂȼ×ÍéÌæ´úÒ»·úÈýÂȼ×Íé½øÐÐÈíÖʾ۰±õ¥ÅÝÄËÜÁϵÄÉú²ú¡£ |

3Â¥2013-05-04 17:07:02
hookhans
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4Â¥2013-05-04 21:26:17













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