engineering recuitment DRDO CEPTAM STA B Tier I (Sr. Technical Assistant) Mock Test 2022 General Knowledge Days and Events

'विश्व पर्यावरण दिवस' साल के किस दिन मनाया जाता है?

1
7th जून 
2
5th जून 
3
1st दिसम्बर 
4
26th जुलाई
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