单选：地面上，增压系统工作在自动方式，当发动机起动好后，如果将FIT/GRD（飞行/地面）电门放到”FLT（飞行）”位，则：（）.A．飞机保持释压

题目内容：
地面上，增压系统工作在自动方式，当发动机起动好后，如果将FIT/GRD（飞行/地面）电门放到”FLT（飞行）”位，则：（）.
A．飞机保持释压
B．飞机将增压到所选择的座舱高度
C．飞机将增压到比起飞机场低200英尺的高度
D．飞机将增压到比起飞机场低300英尺的高度
参考答案：

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