题目内容

Which of the following frequencies is as international distress and safety frequencies on MF for radio telephone?

A. 2187.5 kHz
B. 2174.5 kHz
C. 2182kHz
D. 2177.0kHz

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Which of the followings is main factors to influence the propagation range for VHF?

A. channel
B. frequency
C. antenna height
D. weather

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_________ are provided free of charge by the LES.

A. Distress communications
B. Traffic Lists.
C. Vessel position information to ship owners.
D. GPS relays.

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A DSC call from ship with the called MMSI number 041212345 is _________.

A. an area call
B. a ship to shore call
C. a group call for ship stations
D. a ship-to-ship call

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The communication arrangements are designed to enable distress alerting to be performed in all three directions: _________ in all sea areas.

A. Ship， shore and person
B. Ship to shore， shore to ship and ship to ship
C. Sea to coast， SES to CES and ship to ship
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Which of the following frequencies is as international distress and safety frequencies on MF for radio telephone?

A. 2187.5 kHz B. 2174.5 kHz C. 2182kHz D. 2177.0kHz

Which of the followings is main factors to influence the propagation range for VHF?

_________ are provided free of charge by the LES.

A DSC call from ship with the called MMSI number 041212345 is _________.

The communication arrangements are designed to enable distress alerting to be performed in all three directions: _________ in all sea areas.

A. 2187.5 kHz
B. 2174.5 kHz
C. 2182kHz
D. 2177.0kHz