1、
牙齿磨耗是指在没有龋齿及外伤情况下，牙齿在咀嚼运动和非咀嚼运动过程中，由于牙面与牙面间摩擦、牙面与食物间摩擦，牙齿硬组织的丧失。
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2、
Temperature field thermography on friction facing of certain wear-resistant alloys
几种耐磨合金磨损温度场的热图
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3、
Development and Application of Cermet Friction Facing on Clutch Disc in Heavy Duty Truck
金属陶瓷汽车离合器摩擦片的研制及应用
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4、
Discussion on Test Method for Determining Friction and Wear Properties of Clutch and its Facing
离合器及其面片摩擦磨损性能测试方法探讨
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5、
China to further expand opening up trade friction has become a major issue facing.
贸易摩擦已经成为我国进一步扩大对外开放所面临的重大问题.
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6、
