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单选题
在模拟高度时，确保ATC应答机处于备用状态， 否则可能会意外地产生虚假的TCAS目标。
A
To make sure that ATC transceivers are in standby mode, you must simulate altitude, otherwise false TCAS signals may occur intermittently.
B
Make sure the ATC transmitters are in standby mode, or false TCAS targets may occur accidentally due to altitude simulation.
C
Make sure that the ATC transponders are in standby mode when you simulate altitude. You can accidentally cause false TCAS targets.
答案解析
正确答案：C
相关知识点：
模拟高度时应答机置备用
