The quantity of cooled air delivered by an air conditioning unit should （） the sum of the quantity of air re-circulated to the unit and the quantity mechanically exhausted.<br>A:balance<br>B:not balance<br>C:be more than<br>D:be less than

The quantity of cooled air delivered by an air conditioning unit should （） the sum of the quantity of air re-circulated to the unit and the quantity mechanically exhausted.
A:balance
B:not balance
C:be more than
D:be less than

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