单项选择题
A.水化热高,凝结时间短的水泥B.水化热低,凝结时间短的水泥C.水化热高,凝结时间长的水泥D.水化热低,凝结时间长的水泥
A.1900,1800 B.1800,1800 C.1900,1900 D.1850,1850
A.120,180 B.150,180 C.180,120 D.120,150