（）is a radio receiver with ablity to sense direction of the incoming radio waves.

A、The echo sounder

B、The radar

C、The course recorder

D、The direction finder

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更多“（）is a radio receiver with ablity to sense direction of the incoming radio waves.”相关的问题

第1题

[单选题] The principal advantage of NAVTEX radio warnings is that（）.

A、they can be used by mariners who do not know Morse code B、only an ordinary FM radio is necessary to receive these warnings C、information on a given topic is only broadcast at specified times D、they cover a broad spectrum of the radio band allowing reception on almost any type of receiver

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第2题

[单选题] （）is used for receiving maritime safety information which is automatically printed by the receiver.

A、NAVETEX receiver B、Search and Rescue Transponder C、Emergency Position Indicating Radio Beacon D、Digital selective calling

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第3题

[单选题] A radio link between a transmitting earth station and a receiving earth station through one satellite is named a（）.

A、Radio link B、Space segment C、Satellite link D、upper link

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第4题

[] （）can receive MSI sent by coast station.

A、A.A NAVTEX receiver B、B.An EGC receiver C、C.MF/HF radio telephone D、D.HF radio telephone with NBDP

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第5题

[单选题] We（）the distress signal on our own radio before the shore station relayed it to us.

A、received alreadly B、have received C、had received D、was receiving

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第6题

[] If the radio signal ground wave extends out for less distance than the minimum skywave distance，there is an area in which no signal is received．This is called the（）.

A、A.Skip zone B、B.Blackout zone C、C.Diffraction zone D、D.Shadow zone

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第7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 frequency B、The operator should immediately set continuous watch on the radiotelephone frequency that is associated with the frequency band on which the distress alert was received C、The Operator should immediately set continuous watch on VHF channel 70 D、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