Environment & Ecology · Environmental Studies
भारत में पहली बार 'खतरनाक अपशिष्ट (प्रबंधन और हथालन) नियम' किस वर्ष अधिसूचित किए गए थे?
- 12000
- 21998
- 31989✓
- 41986
सही उत्तर देखें
1989
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