单项选择题
A.HPB235 B.HRB335 C.HRB400 D.HRB500
A.石灰和粉煤灰 B.水泥和粉煤灰 C.火山灰和粉煤灰 D.石灰和火山灰
A.1% B.5% C.10% D.15%
A.铝酸三钙 B.铁铝酸四钙 C.硅酸三钙 D.硅酸二钙
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