railway RRB Technician Grade 3 Mock Test 2024 General Science Biology Invention and Discoveries

ઓક્સિજનની શોધ કોણે કરી?

1
કાર્લ શીલ
2
વિલિયમ્સ
3
હાઇઝનબર્ગ
4
હૂક
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