90公里以下大气区域，具有一个接近恒定的平均分子质量，因此称为均匀层。
The region of the atmosphere below90km has a nearly constant mean molecular mass and is therefore called the homo sphere.
测试结果表明，低温短期老化时沥青的质量增加，平均分子量增加。
The results indicated that the asphalt quality and its average molecular weights were increased after ageing of short duration at low temperature.
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