When the temperature and humidity of air is low, we usually use __________ draft cooling tower.

When the temperature and humidity of air is low, we usually use ______

1.	When the temperature and humidity of air is low, we usually use __________ draft cooling tower.
A.	natural
B.	forced
C.	induced
D.	none of these
Answer» B. forced

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When the temperature and humidity of air is low, we usually use __________ draft cooling tower.

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