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单选题
Air supply system is used for pressurizing supply tanks to insure fluid flow.
A
Air supply system provides pressurized air to the supply tanks so that they will maintain a positive supply of fluid flow.
B
The pneumatic system is used for increasing the pressure in the supply tanks to make the hydraulic fluid flow.
C
The engine/APU bleed air or external ground air is the main source to pressurize supply tanks to provide a positive supply of fluid to the pumps.
答案解析
正确答案：B
