它通常包括以下十二类零件：螺栓、螺柱、螺钉、螺母、自攻螺钉、木螺钉、垫圈、挡圈、销、组合件和连接副、焊钉等。
Usually there are 12 categories which are bolt , stud, screw, nut , self tapping screw, wood screw, gasket, retainer ring, pin, composite member, bolting, and soldering lamp.
凸轮挺柱机构是内燃机的重要零件副之一，其性能的优劣直接影响到内燃机的经济性和可靠性。
The function of the cam follower directly influences the economic value and reliability of an internal combustion engine, so the cam follower is studied in this paper.
在山东蒙阴金伯利宕的副矿物蒙山矿中，首次发现了成分为柱红石类的新矿物相。
A new mineral facies has been found for the first time in mathiasite, a minor mineral in the Mengying kimberlite in Shandong Province, resembling priderite in composition.
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