粗密级配
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coarse dense gradation
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The results show that best permanent deformation resistance can be got when continuous dense gradation, which has even arrangement of coarse and fine aggregate is adopted.
结果表明，采用粗细集料搭配均匀的连续密级配和适中的沥青用量可以获得最佳的抗永久变形能力。
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