*/*_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

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