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单选题
320. The usual control for the left pack makes sure that it supplies air at a temperature That gives the necessary cooling for the fight compartment
A
The usual control for the left pack ensures that it supplies air at a temperature. The temperature gives the occasional cooling for the flight compartment.
B
The normal control for the left pack makes sure that it supplies air. The cooling provides the necessary temperature for the flight compartment.
C
The usual control for the left pack assures that the temperature of the supplied air will provide the control cabin with the needed cooling.
答案解析
正确答案：B
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