石灰石中有害杂质有（）。

A.72π
B.72
C.100π
D.100

A.CaO 90.99%、MgO 3.98%、SiO₂0.40%、灼减4.22%、活性度398ml
B.CaO 92.80%、MgO 3.48%、SiO₂0.37%、灼减2.91%、活性度406ml
C.CaO 93.53%、MgO 3.94%、SiO₂0.49%、灼减1.82%、活性度319ml
D.CaO 93.28%、MgO 3.71%、SiO₂0.41%、灼减2.33%、活性度305ml