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Aviation
containing
回信
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信号返回
signal return
及时回答信息系统
instant responses information system
回叫信号
call-back
回收信标评估
recovery beacon evaluation
回答信号
call-back
掉闸回路断线信号
breakage signal of trip circuit
接地信号回路
grounding signal circuit
闪光信号回路
flashing-signal circuit
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