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单选题
239、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 transfer unit system supplies alternate hydraulic pressure to ＇the leading ledge flaps and slats when hydraulic system engine-driven pump pressure is below normal.
B
When hydraulic system B engines drive/pump pressure is under normal conditions,the hydraulic power 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 edge flaps and slats when hydraulic system B engine-driven pump pressure is abnormal
答案解析
正确答案：A
解析：
解析:below 在…下面,低于,少于;normal 正常;abnormal 异常。standly 备用的
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