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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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出自：海船船员证

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