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【单选题】

A RADIO SIGNAL FROM A DISTRESSED VESSEL AUTOMATICALLY DIRECTED TO A RCC GIVING POSITION，IDENTIFICATION，COURSE AND SPEED OF THE VESSEL AS WELL AS THE NATURE OF DISTRESS is known as（）.

A、Distress alert

B、Safety alert

C、Emergency alert

D、General alert

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第1题
[单选题] Echo sounder sends a（） (无线电信号)from the bottom of the ship to the seabed.

A、radio signal  B、radio wave  C、signal  D、signal radio  

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第2题
[单选题] （）is the most visible signal of distress from a lifeboat at sea in the daytime.

A、Smoke signal  B、Flash signal  C、Fire signal  D、Radio emergency transmission  

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第3题
[] （）is the most visible signal of distress from a lifeboat at sea in the daytime.

A、A.Smoke signal  B、B.Flash signal  C、C.Fire signal  D、D.Radio emergency transmission  

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第4题
[单选题] （）sends a radio signal from the bottom of the ship to the sea-bed,from which it is reflected.

A、The marine sextant  B、The chronometer  C、The echo sounder  D、The radar  

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第5题
[单选题] （）sends a radio signal from the bottom of the ship to the sea-bed,from which it is reflected.

A、The marine sextant  B、The chronometer  C、The echo sounder  D、The radar  

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第6题
[单选题] An icebreaker may use the code letter “K” to remind ships of their obligation to listen continuously on their radio. This signal may be made by any of the following EXCEPT（）.

A、sound signal  B、light signal  C、visual signal  D、radiotelephone  

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第7题
[单选题] A signal derived from a controlled function and returned to the initiating point is called a/an （）.

A、monitoring signal  B、inverse signal  C、reverse signal  D、feedback signal  

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第8题
[单选题] Every radio installation shall be clearly marked with the（）, the ship station identity and other codes as applicable for the use of the radio installation.

A、call sign  B、port of register  C、radio name  D、signal label  

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第9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 signal  B、the Morse Code signal for SOS  C、a computerized voice announcement of Mayday  D、your vessel's International Radio Call Sign  

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