单项选择题
A.145.80m3 B.129.6m3 C.121.5m3 D.253.12m3
A.532 B.522 C.512 D.502
A.长跨方向,5~8m B.短跨方向,5~8m C.长跨方向,4~6m D.短跨方向,4~6m