单项选择题
A.5.5%B.4.5%C.3.5%D.5.0%
A.25.0% B.26.0% C.25.5% D.26.2%
A.颗粒级配 B.比表面积 C.80μm筛余 D.45μm筛余
A.5s B.15s C.30s D.60s
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