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1. A fermentation system has a KLa of 3 s-1 and a C0 of 5 ppm of O2. If the bulk liquid is completely depleted of oxygen, then the oxygen transfer rate will be equal to
(A): 10 mg.l-1.s-1
(B): 15 mg.l-1.s-1
(C): 5 mg.l-1.s-1
(D): zero
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