Asphaltene content increased, the deterioration of oil quality.
沥青质含量增高时，原油质量变坏。
Others: crude oil asphaltene content of less than 1% in general.
其他：原油中沥青质的含量较少，一般小于1%。
It has been found that the age hardening of asphalts is mainly due to the increase of asphaltene content.
沥青质含量的增加是沥青老化后性质变坏的重要原因。
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