单选题If there is any doubt as to the proper operation of a radar，which statement is TRUE?（）.AOnly a radar expert can determine if the radar is operatingBAll radars have indicator lights and alarms to signal improper operationCA radar range compared to the actual range of a known object can be used to check the operation of the radarDThe radar resolution detector must be energized to check the radar
单选题
If there is any doubt as to the proper operation of a radar，which statement is TRUE?（）.
A
Only a radar expert can determine if the radar is operating
B
All radars have indicator lights and alarms to signal improper operation
C
A radar range compared to the actual range of a known object can be used to check the operation of the radar
D
The radar resolution detector must be energized to check the radar
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