Which type of cement is produced by grinding clinkers formed by calcining bauxite, lime, iron oxide with a little ferric oxide, silica magnesia, etc? (Note that alumina content in this type of cement should NOT be less than 32%.)

Which type of cement is produced by grinding clinkers formed by calcin

1.	Which type of cement is produced by grinding clinkers formed by calcining bauxite, lime, iron oxide with a little ferric oxide, silica magnesia, etc? (Note that alumina content in this type of cement should NOT be less than 32%.)
A.	Coloured cement
B.	High alumina cement
C.	Blast furnace cement
D.	Acid resistance cement
Answer» C. Blast furnace cement