Teaching KVS Stenographer Mock Test General Science Biology Biology in Everyday life

ଭିଟାମିନ୍ B12ରେ ଥିବା ଧାତୁ ହେଉଛି:

1
ସୋଡିୟମ୍
2
କୋବାଲ୍ଟ
3
ମ୍ୟାଗ୍ନେସିୟମ୍
4
ଲୌହ 
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