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单选题
648 将大量压缩空气从气源输送到其他系统,如环境控制、除冰等连接点的组件和部件(管道和活门)
A
Components and components(ducts and valves) that transport high pressure air from the air source to other systems,such as environmental control,de-icing,etc.
B
Those units and components(ducts and valves)which deliver large volumes of compressed air from a power source to connecting points for such other systems as environmental controls, deicing, etc.
C
Conveying large quantities of compressed air from the intake line to other systems, such as environmental control, de-icing, etc. Components and components(ducts and valves) at connectionpoints.
答案解析
正确答案：B
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