Porosity of fireclay refractories is _______________ percent?
(A) 5-10
(B) 10-25
(C) 25-35
(D) 35-50
Porosity of fireclay refractories is _______________ percent?
(A) 5-10
(B) 10-25
(C) 25-35
(D) 35-50
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