单项选择题
A.95%B.1.3%~1.5%C.5%~8%D.15%~20%
A.50~70gB.80~100gC.160~180gD.190~200g
A.出砂性B.硬度C.干强度D.湿强度
A.20%~30%B.65%~70%C.2%~4%D.1.5%~3%
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