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

इम्हाॅफ टैंक में प्रवाह का वेग ______________से अधिक नहीं होना चाहिए। 

1
2 m/min
2
1.8 m/min
3
0.3 m/min
4
0.9 m/sec
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