射频识别（Radio Frequency Identification，RFID）技术的基本原理是磁波理论。
射频识别技术RFID(Radio Frequency Identification)是20世纪90年代开始兴起的一种自动识别技术。
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射频识别技术的英文全称是Radio Frequency Identification缩写（）
射频识别技术（Radio Frequency Identification，RFID）是利用（）对记录媒体进行读写的一种识别技术。A、光波B、无线电波C、声波D、电缆
RFID（Radio Frequency IDentification，无线射频识别器）的两个基本器件是（）。A、阅读器和标签B、标签和发射器C、阅读器和发射器D、阅读器，标签和发射器
（）即RFID（Radio Frequency IDentification）技术，可通过无线电信号识别特定目标并读写相关数据。A、电子手铐B、射频识别C、指纹识别D、手机定位
单选题When can routine communications be resumed on a frequency or channel on which radio silence has been imposed? （）A After determining that the frequency or channel appears to be no longer in useB After determining that geographic distance from the distress situation will prohibit any other signal from interfering with emergency communicationsC After the Rescue Coordination Center transmits a message on the frequency or channel being used for emergency communications stating that such traffic has concludedD Routine communications can resume if，in the Master's opinion，communications on that frequency or channel will not interfere with emergency communications
单选题If you know that the vessel you are about to call on the VHF radio maintains a radio watch on both the working and the calling frequencies，which frequency should you call on? （）A Calling frequencyB Distress frequencyC Urgency frequencyD Working frequency
