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[单选题]
骨料粒径在5mm以上,堆积密度小于()kg/m3的轻质骨料,称为轻粗骨料。
A.800
B.900
C.1000
D.1100
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A.800
B.900
C.1000
D.1100
A.小于2mm
B.小于3mm
C.小于5mm
D.小于6mm
粗骨料应采用二级或多级级配,其松散堆积密度应大于1500kg/m3,紧密空隙率宜小于40%。()
粗骨料应采用二级或多级级配,其松散堆积密度应大于1500kg/m3,紧密空隙率宜小于40%,吸水率应小于2%。()