A. 坍落度是表示塑性混凝土拌和物和易性的指标
B. 干硬性混凝土拌和物的坍落度小于10mm时须用维勃稠度(s)表示其稠度
C. 泵送混凝土拌和物的坍落度一般不低于100mm
D. 在浇筑板、梁和大型及中型截面的柱子时，混凝土拌和物的坍落度宜选用70～90mm
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