The volatility and valve train wear are the two difficulties encounted inthe formulation of low viscosity multigrade engine oil.
研究和制备低粘度多级油应充分考虑挥发性和磨损。
Room Experiments of the Effects of Crude Oil Viscosity. Valve Diameter and Pumping Speed on Pump Efficiency of Sucker Rod Pumping System
粘度、凡尔孔径及冲次对抽油系统泵效影响的室内试验
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