engineering recuitment BEL Probationary Engineers Mock Test 2025 General Science Biology Invention and Discoveries

ଶବ୍ଦ "ଭିଟାମିନ୍" କାହା ଦ୍ୱାରା ପ୍ରସ୍ତୁତ କରାଯାଇଥିଲା 

1
ଏଡୱାର୍ଡ ଜେନେର୍ 
2
ଆର ମିଶ୍ର
3
ସିଫଙ୍କ୍ 
4
ଲୁନିନ୍ 
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