等级划分
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grade-determination of cultivated land 耕地分等定级
·2,447,543篇论文数据，部分数据来源于NoteExpress
Introduced hereby are the treatment of the old cement concrete pavement, measures to prevent reflective cracking and the profile design and transverse grade determination in road design.
介绍了旧水泥混凝土路面处理、防止反射裂缝措施、道路设计中纵断面设计和横坡确定。
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