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单词 Track formation
释义

Track formation

英语百科

Grading (engineering)

Section through railway track and foundation showing the sub-grade.
Modern road grader

Grading in civil engineering and landscape architectural construction is the work of ensuring a level base, or one with a specified slope, for a construction work such as a foundation, the base course for a road or a railway, or landscape and garden improvements, or surface drainage. The earthworks created for such a purpose are often called the sub-grade or finished contouring (see diagram).

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