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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三中单体的聚合产生了具有两相的三元共聚物，一个是苯乙烯-丙烯腈的连续相， 另一个是聚丁二烯橡胶分散相。

The polymerization of the three monomers produces a terpolymer which has two phases: a continuous phase of styrene-acrylonitrile (SAN) and a dispersed phase of polybutadiene rubber.

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