单项选择题
A.现浇箱梁桥B.预制空心板梁桥C.预制T 梁桥D.现浇板梁桥
A.10-40MB.20-30MC.20-40MD.30-50M
A.2B.3C.4D.5
A.40%,60%B.60%,40%C.30%,70%D.70%,30%
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