Gypsum bonded investment should not be heated over______________?
(A) 700°C
(B) 1,300°C
(C) 1,063°C
(D) 900°C
Gypsum bonded investment should not be heated over______________?
(A) 700°C
(B) 1,300°C
(C) 1,063°C
(D) 900°C
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