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单选题
511.What happens when the A/THR function is engaged and not active?
A
The A/THR system controls the engines and the A/THR pushbutton light is ON.
B
The thrust levers control the engines and the A/THR pushbutton light is OFF.
C
The thrust levers control the engines and the A/THR pushbutton light is ON.
F
答案解析
正确答案：C
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