单项选择题
A.200tB.150tC.100tD.50t
A.≥75%B.≥80%C.≥84%D.≥88%
A.流动度≥310mm,30min后流动度不应小于230mmB.流动度≥320mm,30min后流动度不应小于230mmC.流动度≥310mm,30min后流动度不应小于240mmD.流动度≥320mm,30min后流动度不应小于240mm