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.
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.
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.
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