单项选择题

A.挠度f/=42.5mm>L0/250=34mm,不满足规范要求
B.挠度f/=42.5mm>L0/300=28.3mm,不满足规范要求
C.挠度f/=42.5-8.5=34mm=L0/250,满足规范要求
D.挠度f/=42.5-8.5=34mm>L0/300=28.3mm,不满足规范要求