题目内容

In which mode should urgency communication "to all stations" by direct printing telegraphy normally be established?

A. FEC mode at a good propagation only possible
B. ARQ mode
C. FEC mode
D. FEC mode， the ARQ mode may also be used

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A SART will generates a series response signals when it _________.

A. is put into water upright
B. generates visual and audible indication
C. is being interrogated by 9GHz shipborne or airborne radar
D. is along its line of bearing and extends on 8nm outward from its position

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The letter D is the abbreviation for the word distress in _________.

ADE
B. GMDSS
C. NBDP
DSC

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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

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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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In which mode should urgency communication "to all stations" by direct printing telegraphy normally be established?

A. FEC mode at a good propagation only possible B. ARQ mode C. FEC mode D. FEC mode， the ARQ mode may also be used

A SART will generates a series response signals when it _________.

The letter D is the abbreviation for the word distress in _________.

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

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

A. FEC mode at a good propagation only possible
B. ARQ mode
C. FEC mode
D. FEC mode， the ARQ mode may also be used