Computer · Sewage Treatment and Disposal
निम्नलिखित में से कौन सा एक सीवर उपसाधन (sewer appurtenance) नहीं है?
- 1ग्रीस और ऑयल ट्रैप
- 2मैनहोल
- 3फ्लशिंग टैंक
- 4सेप्टिक टैंक✓
सही उत्तर देखें
सेप्टिक टैंक
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