330. Pick up the correct statement from the following :
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331. The first 20 days demand required for the oxidation of organic matter, is called
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332. BOD5 is biochemical oxygen demand at a temperature of
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333. Pick up the bacteria found in abundance from the following :
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334. Sewage disposal by dilution is resorted to, if
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335. Sea water contains less oxygen as compared to fresh river water
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336. The flowing river water in natural drainage gets cleaned by
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