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单选题
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
When hydraulic system B engine drive pump pressure is under normal conditions，the hydraulic power transfer unit system supplies standby hydraulic pressure to the leading edge flaps and slats.
B
The hydraulic power transfer unit system is provide spare hydraulic pressure to the leading edge flaps and slats when hydraulic system B engine-driven pump pressure is abnormal.
C
The hydraulic power transfer unit system supplies alternate hydraulic pressure to the leading edge flaps and slats when hydraulic system B engine-driven pump pressure is below normal.
答案解析
正确答案：C
相关知识点：
液压B泵压力低时组件供备用
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