多项选择题
A.27.49修约到个位数,27.49→27B.27.49修约到个位数,27.49→27.5→28C.27.49修约到一位小数,27.49→27.5D.60.25修约到个位数的0.5单位修约,60.25→120.50→120→60.0
A.1250B.1251C.1304D.1401
A.400mmB.450mmC.500mmD.600mm
A.F5B.F4C.F3D.F2
A.重混凝土B.素混凝土C.普通混凝土D.轻骨料混凝土
A.40B.35C.30D.25
A.532B.530C.534D.530.2
A.13.6B.13.7C.13.65D.13.60
A.150~180mmB.190~220mmC.180~200mmD.230~260mm
A.5B.2C.1D.3
A.(3~6)r/minB.(2~5)r/minC.(4~7)r/minD.(3~5)r/min