阀座材料应该是下列材料之一：乙烯-丙烯-二烯系单体或氟橡胶，在顶部和底部配置聚四氟乙烯轴承支撑。

The seat material shall be one of the following materials: ethylene-propylene-diene monomer or fluoroelastomer with polytetrafluoroethylene bearing support at the top and bottom.

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ABS的多功能性來源于其三种组成单体丙烯睛，丁二烯和苯乙烯。

The versatility of ABS is derived from its monomer building blocks Acrylonitrile, Butadiene and Styrene.

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这些化合物能均聚反应，亦易与苯乙烯、甲基丙烯酸甲酯及丙烯腈等乙烯类单体共聚合，得有色的高聚物。

These colored compounds can be homopolymerized and copolymerized with most vinyl monomers such as styrene, methyl methacrylate and acrylonitrile, to give the corresponding colored polymers.

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