railway RRB Technician Grade 3 Mock Test 2024 General Knowledge Ecology and Environment Conservation efforts: India and World

ओजोन छिद्र किसके कारण होता है

1
एसिटिलीन
2
ईथीलीन
3
क्लोरोफ्लोरोकार्बन
4
मीथेन
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