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单选题
在模拟高度时确保ATC应答机处于待机状态。
A
When simulating altitude, make sure you have alternate ATC transponders in active mode.
B
Make sure that the ATC transponders are in standby mode when you simulate altitude.
C
It is optional to keep the ATC transponders in ready mode during altitude simulation.
答案解析
正确答案：B
相关知识点：
模拟高度时确保应答机待机
