%_Refractoriness/fusion points of 'superduty' refractories is ________

1.	%_Refractoriness/fusion points of 'superduty' refractories is __________ ¬¨‚àûC._%
A.	1520-1630
B.	1630-1670
C.	> 1730
D.	> 2000
Answer» D. > 2000

Discussion