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{:(1.,"Diamagnetic materials",(a),"Steel,Alnico"),(2.,"Paramagnetic materials",(b),"Bi, Sb,Cu"),(3.,"Ferromagnetic materials",(c),"Pt,Cr,Mn"),(4.,"Permanent magnets",(d),"Fe, Ni, Co etc.,"):} |
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Answer» `{:("(1)","(2)","(3)","(4)"),(B,a,d,C):}` |
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