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Radio Frequency
射频识别（Radio Frequency Identification，RFID）技术的基本原理是磁波理论。
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射频识别技术的英文全称是Radio Frequency Identification缩写（）
Which of the following communication methods will provide the maximum bandwidth for video streaming through a media extender？（）A、100BaseT EthernetB、802.11gC、Z-WaveD、Bluetooth
单选题When testing a Class A EPIRB you will know the EPIRB is working properly if you hear on 99.5 Mhz FM or any vacant frequency on a nearby AM radio（）.A a distinctive signalB the Morse Code signal for SOSC a computerized voice announcement of MaydayD your vessel's International Radio Call Sign
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
单选题What is the action that a GMDSS Radio Operator should take when a DSC distress alert is received? （）A No action is necessary，as the DSC control unit will automatically switch to the NBDP follow-on communications frequencyB The operator should immediately set continuous watch on the radiotelephone frequency that is associated with the frequency band on which the distress alert was receivedC The Operator should immediately set continuous watch on VHF channel 70D The Operator should immediately set continuous watch on the NBDP frequency that is associated with the frequency band on which the distress alert was received
判断题射频识别（Radio Frequency Identification，RFID）技术的基本原理是磁波理论。A 对B 错
