单项选择题
以下()中数据分别是碎石土管沟沟底铺垫层和细土回填层的颗粒粒径、管底垫层和细土回填层的厚度。
A.10mm,300mm
B.20mm,200mm
C.15mm,200mm
D.15mm,300mm
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单项选择题
A.10mm,300mm
B.20mm,200mm
C.15mm,200mm
D.15mm,300mm
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