The best pickling solution for gypsum bonded investment is_______________?
(A) Hydrochloric acid
(B) Nitric acid
(C) Sulphuric acid
(D) Phosphoric acid
The best pickling solution for gypsum bonded investment is_______________?
(A) Hydrochloric acid
(B) Nitric acid
(C) Sulphuric acid
(D) Phosphoric acid
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