The drinking water will be safe if its biochemical oxygen demand (B.O.D) is

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The drinking water will be safe if its biochemical oxygen demand (B.O.D) is

A0

B5

C10

D25

Answer:

A. 0

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ഓർമ്മയുമായി ബന്ധപ്പെട്ട് നിങ്ങൾക്ക് യോജിക്കാൻ കഴിയാത്തത് ഏത് ?