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

कच्चे सीवेज में पाया जाने वाला भारी खनिज पदार्थ क्या कहलाता है?

1
ग्रिट
2
बजरी
3
गाद
4
काँच(ग्लास)
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