The command used to check an AP's working radio varies depending on the version of the connected AC.
In versions earlier than V200R006, run the display actual channel-power { ap-id ap-id radio-id radio-id | all } command in any view and check the value of RADIO.
In V200R006 and later versions, run the display radio { all | ap-group ap-group-name | ap-name ap-name | ap-id ap-id } command in any view and check the value of RfID.