合成橡胶

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(()(chéng )(xiàng )(jiāo )()(chéng )(xiàng )(jiāo ))

()(yǒu )(lèi )()()(tiān )(rán )(xiàng )(jiāo )(de )(dàn )(xìng )()(liú )(huà )(néng )()(děng )(xìng )(zhì )(de )()(chéng )()(zhì )(shì )()(shí )(yóu )(méi )(tiān )(rán )()(diàn )(shí )(děng )(wéi )(yuán )(liào )(tōng )(guò )()()(zuò )(yòng )(huò )(gòng )()(zuò )(yòng )()(chéng )(de )()(dīng )(běn )(xiàng )(jiāo )()()(xiàng )(jiāo )()(chéng )(xiàng )(jiāo )(zhǒng )(lèi )(hěn )(duō )(zài )(mǒu )(xiē )(fāng )(miàn )()()(dài )()(tiān )(rán )(xiàng )(jiāo )(yǒu )(xiē )(pǐn )(zhǒng )(hái )()(yǒu )(mǒu )(zhǒng )(chāo )(guò )(tiān )(rán )(xiàng )(jiāo )(de )()(xìng )

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