How much of alumina in weight percent is added to silica refractories?

1.	How much of alumina in weight percent is added to silica refractories?
A.	0.2 ‚Äö√Ñ√∂‚àö√ë‚àö¬® 1.0
B.	1.1 ‚Äö√Ñ√∂‚àö√ë‚àö¬® 1.5
C.	1.6 ‚Äö√Ñ√∂‚àö√ë‚àö¬® 1.8
D.	> 2.0
Answer» B. 1.1 ‚Äö√Ñ√∂‚àö√ë‚àö¬® 1.5

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