state gov DDA Assistant Section Officer (ASO) Mock Test 2023 General Knowledge Science Technology and Inventions

एडवर्ड जेनर ने _______ की खोज की।

1
टीकाकरण
2
इलेक्ट्रोक्यूशन
3
डायलिसिस
4
ओपन हार्ट सर्जरी
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