Environment & Ecology · Environmental Engineering
पीने के पानी में ई. कोलाई सूचकांक (E. coli index) मुख्य रूप से क्या दर्शाता है?
- 1कठोरता
- 2pH मान
- 3रोगजनकों (pathogens) की उपस्थिति✓
- 4क्लोरीन का स्तर
सही उत्तर देखें
रोगजनकों (pathogens) की उपस्थिति
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