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  • 哪种PP料抗冲击力好
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  • 什么PP料抗冲击最大
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  • pp新料抗冲击力多少
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  • 哪种Pp料抗刮花
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  • pp料抗冲击强度
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  • 新料pp料的冲击力
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  • 塑料椅子哪种pp料好
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  • 哪种pp料粘度更好
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  • 哪种pp料比较硬
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  • 哪种pp料收缩大
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  • 哪种pp料轻些
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  • 开水壶是用哪种pp料
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