题目内容

How to prevent the reception of unwanted broadcasts by vessels utilizing the NAVTEX system?

A. Operating the receiver only during daytime hours
B. Programming the receiver to reject unwanted broadcasts
Coordinating reception with published broadcast schedules
D. Automatic receiver de-sensitization during night hours

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The SARTs works on _________

A. S-band
B. VHF-band
C. X-band
D. L-band

Maritime Safety Information includes _________. ① meteorological warnings ②meteorological warnings and forecasts ③ other urgent safety related messages broadcast to ships

A. ①②
B. ②③
C. ①③
D. ①②③

Signals for locating will be transmitted by _________ in 9GHz band.

A. SART
B. DSC
C. NBDP
D. RT

胶粒电荷类型由( )电荷类型决定

A. 电位离子
B. 反离子
C. 扩散层
D. 吸附层