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单词 precipitation number
释义 precipitation number
[prǝ´sip·ǝ`tā·shǝn ´nǝm·bǝr]
ANALYTICAL CHEMISTRY
The number of milliliters of asphaltic precipitate formed when 10 milliliters of petroleum-lubricating oil is mixed with 90 milliliters of a special-quality petroleum naphtha, then centrifuged according to American Society for Testing and Materials test conditions; used to determine the quantity of asphalt in petroleum-lubricating oil.
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