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1. Thefriction mandrel is used to measurethe friction between two surfaces.
摩擦杆用于测量两个表面之间的摩擦力。
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2. The frictionmandrel was usedto test the material'sresistance to wear.
摩擦杆用于测试材料的耐磨性。
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3. The friction mandrel was usedto measure the friction between the moving partsof the machine.
摩擦杆用于测量机器移动部件之间的摩擦力。