It is found that the friction coefficient increases with the increase of sliding velocity, and there is critical velocity.
试验发现，摩擦系数随滑动速度的增加而增加，存在临界滑动速度。
It is found that the friction coefficient increases with the increase of sliding velocity, and there is critical velocity.
试验发现，摩擦系数随滑动速度的增加而增加，存在临界滑动速度。
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