Which one of the following elements is NOT added is small amount to be used as grain refiners ?
(A) Iridium
(B) Ruthinium
(C) Indium
(D) Platinum
Which one of the following elements is NOT added is small amount to be used as grain refiners ?
(A) Iridium
(B) Ruthinium
(C) Indium
(D) Platinum
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