单项选择题
A.平拱砖过梁 B.弧拱砖过梁 C.钢筋砖过梁 D.钢筋混凝土过梁
A.180mm；360mm B.180mm；365mm C.178mm；360mm D.178mm；365mm
A.120mm B.115mm C.110mm D.125mm
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