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单选题
90.The intermediate pressure check valve [IPCV] prevents air in the HP/IP manifold from going into the fourth stage bleed air source( )
A
The intermediate pressure check valve prevents air from the fourth stage into the HP/IP manifold.
B
The intermediate pressure check valve prevents air from going into the fourth stage bleed air source.
C
The intermediate pressure check valve is interchangeable with the bleed valve.
答案解析
正确答案：B
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