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垫片

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  • 气门间隙调整垫片的作用是什么？

    周涛 2021-04-21 09:48 发动机在冷态下，当气门处于关闭状态时，气门与传动件之间的间隙称为气门间隙。间隙过大：进、排气门开启迟后，缩短了进排气时间，降低了气门的开启高度，改变了正常的配气相位，使发动机[详细]

    2023-03-06 07:43 分类：问答

  • 垫片的种类？

    垫片按其材料和结构特征可分为非金属垫片、金属垫片、金属-非金属组合垫片三大类。垫片是两个物体之间的机械密封，通常用以防止两个物体之间受到压力、腐蚀、和管路自然热胀冷缩泄漏。[详细]

    2023-02-12 22:21 分类：问答

  • Is it OK to allow users to query an OLTP SQL Server database with excel?

    I have a SQL Server 2005 database used by several applications. Some users wish to query the database directly from excel. I can understand this, because it is a useful tool for ad hoc q开发者_如何学[详细]

    2022-12-27 12:13 分类：问答

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