Poling process is used for: (a) The removal of \( \mathrm{Cu}_{2} \...
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0Poling process is used for:
(a) The removal of \( \mathrm{Cu}_{2} \mathrm{O} \) from \( \mathrm{Cu} \)
(b) The removal of \( \mathrm{Al}_{2} \mathrm{O}_{3} \) from \( \mathrm{Al} \)
\( \mathrm{P} \)
(c) The removal of \( \mathrm{Fe}_{2} \mathrm{O}_{3} \) from \( \mathrm{Fe} \)
(d) All of these
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