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单选题
878.The positive pressure relief valves are fail safe devices that bleed fuselage pressure overboard if the aft outflow valve fails closed( )
A
The positive pressure relief valves are fail safe devices. If the aft outflow valve can＇t be closed, these positive pressure relief valves bleed fuselage pressure overboard.
B
The positive pressure relief valves are fail safe devices. If the positive pressure relief valves fails closed , these aft outflow valve bleed fuselage pressure overboard.
C
The positive pressure relief valves are fail safe devices. If the aft outflow valve fails closed, these positive pressure relief valves bleed fuselage pressure overboard.
答案解析
正确答案：C
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