题目内容
Base course cannot be composed of crushed stone, crushed slag, and other untreated or stabilized materials.
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Rigid pavements have sufficient flexural strength to transmit the wheel load stresses to a wider area below.
The thin layer of bitumen coating between an existing bituminous layer and a new bituminous layer is tack coat.
Improper design of pavements will not lead to early failure of pavements affecting the riding quality.
果树生长季节土壤中耕的深度一般要是
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