PVT代表压力、速度和时间，在选择轴承材料时，不能把单个因素分开考虑。
PVT represents pressure, velocity and time. Don't calculate single factor in choosing material of bearings.
考察了载荷和速度等可控因素对这种轴承摩擦系数的影响。
The influence of some controllable factors, such as load and speed, on the friction coefficient of the bearing was investigated.
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