| http://www.w3.org/ns/prov#value | - A process for enhancing cleaning ability of an aliphatic hydrocarbon having 8 to 20 carbon atoms in average by adding an organic compound having a polar group, such as an alcohol, an ether, an ester, a carboxylic acid, or a ketone, has been proposed (Japanese Patent Application Laid-Open No. Heisei 3(1991)-146597).
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