單項選擇題設(shè)計路基橫斷面時,應(yīng)先根據(jù)便線路基面土質(zhì)情況確定其寬度。土質(zhì)路基寬度和砂石路基寬度各采用()

A.4.4m和5m
B.5m和4.4m
C.6m和5m
D.5m和6m


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