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.正确答案C
