engineering recuitment BPSC Assistant Sanitary & Waste Management Officer Mock Test 2022 Environmental Engineering

ठोस अपशिष्ट प्रबंधन का सबसे महंगा घटक क्या है?

1
संग्रहण 
2
भण्डारण 
3
उपचार 
4
पृथक्करण
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