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Reported Question / Answer
Q.) Bubble free aeration systems requires
1)
carbon dioxide instead of air to supply oxygen
2)
silicone tubing or gas permeable membranes to facilitate gas transfer
3)
filled headspace of the reactor with carbon dioxide
4)
silicone tubing or gas permeable membranes to remove carbon dioxide by oxygen in the form of hydrogen peroxide
5)
NULL
Answer :
2
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