Sound from the market development, engineering design, manufacturing, quality assurance, after-sales service network management system.

健全了从市场开发，工程设计，加工制造，品质保证，售后服务网管理体系。

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Abstract: in order to ensure highway tunnel safety and operation in clear and maintaining a certain level of service, the traffic engineering design and perfect must give enough attention.

摘要：为了确保公路隧道内行车安全、运营畅通和维持一定的服务水平，交通工程的设计与完善必须给予足够的重视。

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A successful way was proved to design spring materials and assure all properties on active service in spaceflight engineering.

证实了保证航天工程用特殊弹簧部件全面服役性能质量的材料设计方法的成功。

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