If there is any doubt as to the proper operation of a radar, which statement is TRUE?(1.0)
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 know object can be used to check the operation of the radar. D.The radar resolution detector must be energized to check the radar.正确答案C
