... petroleum grease 石油润滑脂 petroleum hydrometer 石油比重计 petroleum leve 石油醚 ...
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Specification for petroleum hydrometer 石油密度计技术条件
Three conventional methods for measurement of petroleum density are described in the present paper. They are pycnometer method, hydrometer method and digital densimeter method.
本文介绍了三种测定石油密度的方法，传统的密度计法和密度瓶法及现代的数字密度计法。
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