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Bluetooth is a （）technology.
- A、Satellite
- B、Microwave
- C、Light wave
- D、Radio Frequency
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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
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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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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
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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
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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
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单选题Details of coast radio stations and radar stations can be found in（）.A
Admiralty ChartB
Admiralty Light listC
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单选题Whenever your marine radio is on，FCC Rules require you to monitor（）.A
a commercial ship-to-ship channelB
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单选题The transmission time duration of a single pulse of radio-frequency energy is a function of the（）.A
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单选题A flashing light is a light that（）.A
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单选题What is the fundamental purpose for imposing radio silence? （）A
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To ensure that only voice communications can be effected on the distress frequency or channelC
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To ensure that interference on a particular frequency or channel to communications concerning emergency traffic is minimized
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单选题When can routine communications be resumed when 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
Routine communications can resume after the Rescue Coordination Center transmits a message on the frequency or channel being used for emergency communications stating that such traffic has concludedD
If，in the Master's opinion，communications on that frequency will interfere with emergency communications
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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
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