在生产改良沥青中，最佳的流变性能的最佳时间取决于混合物的组成和剪切率使用。
The optimal time which produces the best rheological properties of modified asphalt depends on the blend composition and on the shear rate used.
另外在沥青路面和赛道上进行的环形竞速也广受欢迎，那些参赛的车辆都进行了足够的改良。
Also ring racing was popular on asphalt and ground tracks. It was enough to have a modified road car to take part in the racing.
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