为自己加油

Air is bled from the pneumatic manifold and conditioned by two separate and independent cooling packs. In the above sentence ,"pneumatic manifold" ，“cooling packs”means

A.配平空气管道，冷却组件;
B.侧壁竖管，空调组件;
C.顶部分配管，冷却组件;
D.气源总管，冷却组件;