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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
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更多 “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” 相关考题
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
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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
考题
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
考题
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
考题
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
考题
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
考题
单选题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
考题
单选题What is the fundamental purpose for imposing radio silence? （）A
To ensure that interference to proprietary communications is minimizedB
To ensure that only voice communications can be effected on the distress frequency or channelC
To ensure that a distressed vessel will have a window twice each hour for transmitting routine messagesD
To ensure that interference on a particular frequency or channel to communications concerning emergency traffic is minimized
考题
单选题Whenever your marine radio is on，FCC Rules require you to monitor（）.A
a commercial ship-to-ship channelB
the last frequency that was usedC
the distress and calling frequencyD
the radio only if expecting a call
考题
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
考题
单选题How is “radio silence” imposed?（）A
By the On Scene Coordinator (OSC)B
By the Coast Earth Station (CES) controlling the distress communications on that frequencyC
It is imposed by the Public Correspondence Station (PCS) controlling the distress communications on that frequency or channelD
It is imposed by the High Seas Service (HSS) controlling the distress communications on that frequency or channel
考题
单选题The transmission time duration of a single pulse of radio-frequency energy is a function of the（）.A
persistenceB
pulse repetition rateC
pulse lengthD
resolution
考题
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
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