理论分析表明，较小的路基不协调变形足以使沥青混凝土路面在路面结构中产生较大的附加应力，应力级位明显上升。
Through studies on computation models of asphalt pavement construction's response to uncoordinated deformation, we figure out the increasing stress of each pavement layer.
对煤焦油沥青进行深加工以提高沥青产品的附加值是煤焦油加工中的一个重要问题。
Further processing of coal pitch to raise the additive value is a key problem in coal tar processing.
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