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单选题
马赫配平被使用当：Mach trim is used when:
A
AP/SP DISC 按钮被选择和自动驾驶接通。AP/SP DISC pushbutton is selected and autopilot is engaged
B
单个安定面配平通道失效和空速超过马赫0.4。A single stabilizer trim channel has failed and airspeed is greater than mach 0.4
C
空速超过230节和襟翼选到8度。Airspeed is greater than 230 KIAS and flaps are selected to 8
D
马赫配平电门被选择和手动操纵飞机空速超过马赫0.4 。MACH TRIM switchlight is selected and aircraft is hand flown at airspeed greater than Mach 0.4
答案解析
正确答案：D
