railway RRB JE (CBT I + CBT II) Mock Test 2024 Environmental Engineering Sewage

सेप्टिक टैंक की अवरोधन अवधि किस क्रम की है?

1
2 - 6 घंटे
2
2 - 4 घंटे
3
12 - 36 घंटे
4
4 - 8 घंटे
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