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单选题
151.兰系统正常由谁增压 which pump supplies pressure to blue system in normal condition?( )
A
一个电动泵 An electric pump
B
一个发动机泵 One engine driven pump
C
两个发动机泵 The two engine driven pump
答案解析
正确答案：B
解析：
题目解析[兰系统正常由谁增压 which pump supplies pressure to blue system in normal condition?]
答案解析：兰系统指的是飞机的蓝色液压系统。在正常情况下，飞机的液压系统通常由发动机驱动的液压泵来增压。因此，正确答案是 B. 一个发动机泵（One engine driven pump）。
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