单项选择题
A.6mm B.4mm C.3mm D.2mm
A.梁身裂纹 B.墩台裂纹 C.支座位移 D.轨道变形
A.6mm B.8mm C.10mm D.12mm
A.1/500 B.1/1000 C.1/1500 D.1/2000
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