Gypsum is______?
(A) CaSO4
(B) CaSO4.1/2H2O
(C) CaSO4,2H2O
(D) CaSO4.3H2O
Gypsum is______?
(A) CaSO4
(B) CaSO4.1/2H2O
(C) CaSO4,2H2O
(D) CaSO4.3H2O
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