Silk thread slides when the job, in China eye outside, for reducing friction, must raise material hardness, smoothness and form.
工作时，丝线在瓷眼表面滑动，为了降低摩擦力，必须提高材料的硬度，光洁度及形状。
The paper measures the friction coefficient of Gongtou brand thread compounds for high torque drill tool.
文中采用传统的四球机法，对工投牌高扭矩钻具螺纹脂的摩擦系数进行了测试。
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