单项选择题
A.30~50mB.60~90mC.60~100mD.50~80m
A.2B.3C.4D.5
A.0.8~1.5mB.0.9~1.5mC.0.8~1.8mD.0.9~1.8m
A.内部交通B.外部交通C.车行游览交通D.过境公路交通
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