Mass Transfer
Antibiotics are best handled in a

Sieve tray contractor
Pulsed column extractor
Rotating disc contactor
Podbielniak extractor

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Mass Transfer
The term "approach" in a cooling tower refers to the difference in the temperature of the

Cold water leaving the tower and the wet bulb temperature of the surrounding air
Hot water entering and the cooled water leaving the cooling tower
Hot water entering the tower and the wet bulb temperature of the surrounding air
None of these

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