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单选题
721 当液压系统B的发动机驱动泵压力低于正常时,液压动力转换组件系统为前缘襟翼和缝翼提供备用液压
A
The hydraulic power transfler unit system supplies alternate hydraulic pressure to the leading edge flaps and slats when hydraulic system
B
When hydraulic system B engine drive pump pressure is under normal conditions, the hydraulicpower transfer unit system supplies standby hydraulic pressure to the leading edge flaps and slats.
C
The hydraulic power transfer unit system is provide spare hydraulic pressure to the leading
答案解析
正确答案：A
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