（）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
（）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
相关考题：
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
Which value is NOT supported by Cisco Spectrum Expert， when checking for RF coverage？（）A、Access point received-signal strength levelB、Spectrum utilizationC、Client data rateD、In-band radio frequency interference
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（）.Aa distinctive signalBthe Morse Code signal for SOSCa computerized voice announcement of MaydayDyour vessel's International Radio Call Sign
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What is the action that a GMDSS Radio Operator should take when a DSC distress alert is received? （）ANo action is necessary，as the DSC control unit will automatically switch to the NBDP follow-on communications frequencyBThe operator should immediately set continuous watch on the radiotelephone frequency that is associated with the frequency band on which the distress alert was receivedCThe Operator should immediately set continuous watch on VHF channel 70DThe Operator should immediately set continuous watch on the NBDP frequency that is associated with the frequency band on which the distress alert was received
单选题What is the fundamental purpose for imposing radio silence? （）ATo ensure that interference to proprietary communications is minimizedBTo ensure that only voice communications can be effected on the distress frequency or channelCTo ensure that a distressed vessel will have a window twice each hour for transmitting routine messagesDTo ensure that interference on a particular frequency or channel to communications concerning emergency traffic is minimized
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