单项选择题
A.30~80m B.30~120m C.50~100m D.70~150m
A.碎石层 B.砂土层 C.黏土层 D.沥青路面
A.3% B.6% C.9% D.12%
A.0.5mB.1mC.1.5mD.2m
微信扫一扫,加关注免费搜题