常見(jiàn)例句Silicones and urethanes are by far the leading sealant products followed by latex and butyl rubber.到目前為止密封劑產(chǎn)品主要是硅樹(shù)脂和聚氨酯橡膠，其次是乳膠和丁基橡膠。 返回 urethanes