题目内容

Which frequency is used for inter-ship DSC calling purposes?

A. 2. 177 kHz.
Both 2, 177 kHz and 156, 525 MHz.
C. 156. 525 MHz.
D. 2, 177 kHz and 2, 189. 5 kHz used in pairs.

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What is the emission designation for VHF-FM voice in the maritime service?

A. F3C.
B. J2B.
C. G3E.
D. J1B.

Which frequency is designated For VHF Digital Selective Calling?

A. 156, 300 MHz.
B. 156. 525 MHz.
C. 156. 650 MHz.
D. 156. 800 MHz.

On VHF band, DSC installations_____________.

A. should be tested daily with radiation of signals
B. should be tested weekly with radiation of signals
C. should be tested monthly with radiation of signals
D. should be tested without radiation of signals

DSC is used primarily to_________.

A. transmit and receive distress and safety alerts to and from other ships and shore stations via radio
B. receive weather warnings, navigational notices and other marine safety information
C. Provide routine communications with the shipowner
D. report ships position to search and-rescue authorities via satellite

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