state gov WBPSC Clerkship Mock Test 2023 - 24 General Knowledge Science Technology and Inventions

आभासी पाण्याची संकल्पना कोणी मांडली?

1
जॉन अँथनी ॲलन
2
नॉर्मन बोरलॉग
3
एमएस स्वामीनाथन
4
ग्लुबलर तिप्पट
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