Environment & Ecology · Environmental Engineering
पेयजल के नमूनों में ई. कोलाई सूचकांक (E. coli index) मुख्य रूप से क्या दर्शाता है?
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मल संदूषण (fecal contamination) और रोगाणुओं (pathogens) की उपस्थिति
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