射频识别（Radio Frequency Identification，RFID）技术的基本原理是磁波理论。
射频识别（Radio Frequency Identification，RFID）技术的基本原理是磁波理论。
相关考题：
下面关于射频技术描述错误的是( )。A．射频技术RF (Radio Frequency)是利用无线电波对记录媒体进行读写B．射频技术不具有保密性C．射频系统的优点是不局限于视线，识别距离比光学系统远D．射频识别的距离可达几十厘米至几米，且根据读写的方式，可以输入数千字节的信息
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When can routine communications be resumed on a frequency or channel on which radio silence has been imposed? （）AAfter determining that the frequency or channel appears to be no longer in useBAfter determining that geographic distance from the distress situation will prohibit any other signal from interfering with emergency communicationsCAfter the Rescue Coordination Center transmits a message on the frequency or channel being used for emergency communications stating that such traffic has concludedDRoutine 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? （）ACalling frequencyBDistress frequencyCUrgency frequencyDWorking frequency
单选题Whenever your marine radio is on，FCC Rules require you to monitor（）.Aa commercial ship-to-ship channelBthe last frequency that was usedCthe distress and calling frequencyDthe radio only if expecting a call
判断题射频识别技术（RFID Radio Frequency Identification）实际上是自动识别技术（AEI Automatic Equipment Identification）在无线电技术方面的具体应用与发展。（）A对B错
单选题How is “radio silence” imposed?（）ABy the On Scene Coordinator (OSC)BBy the Coast Earth Station (CES) controlling the distress communications on that frequencyCIt is imposed by the Public Correspondence Station (PCS) controlling the distress communications on that frequency or channelDIt is imposed by the High Seas Service (HSS) controlling the distress communications on that frequency or channel
单选题The transmission time duration of a single pulse of radio-frequency energy is a function of the（）.ApersistenceBpulse repetition rateCpulse lengthDresolution
判断题Radio Frequency Identification即是射频识别技术，是一种接触式通讯自动识别技术A对B错