Given the scenario that the expected cruise level of FL310 was selected into the FLT ALT selector during preflight, but subsequently the A/C climbed to FL390, would you expect:

发布于 2021-02-03 04:41:08
【单选题】
A A.A differential pressure of 7.45 psi maintained by the negative pressure relief valve;
B B.A differential pressure of 9.1 psi maintained by the positive pressure relief valve;
C C.A differential pressure of 8.35 psi maintained by the forward outflow valve;

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