单项选择题
A.3m B.4m C.5m D.6m
A.0.20mm B.0.25mm C.0.30mm D.0.35mm
A.承受和传递竖向和水平荷载 B.承受和传递竖向荷载 C.承受和传递水平荷载 D.不承受荷载
A.1mm B.0.5mm C.0.8mm D.2mm
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