Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test Environmental Engineering Air and Noise Pollution
DDT belongs to the category of ______________.
1
non-persistent pollutants
2
primary air pollutants
3
persistent pollutants
4
More than one of the above
5
None of the above