engineering recuitment WBMSC Sub Assistant Engineer Civil Mock Test 2023 Environmental Engineering Sewage Sewage Treatment

सेप्टिक टैंक ________के  सिद्धांत पर कार्य करता है।

1
वायुजीवी पाचन
2
अवायवीय पाचन
3
निरंतर प्रवाह
4
वातन प्रणाली
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