railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) General Science Biology Zoology

कोबालामिन हे खालीलपैकी कोणत्या जीवनसत्त्वाचे वैज्ञानिक नाव आहे?

1
C
2
B3
3
B12
4
D
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