The INMARSAT consists of（）major components.……

单项选择题Why should the SES operators be very careful when the ship enters the area where three ocean regions overlap? Because（）.

A.the weather is always terrible
B.the condition there is complicated
C.the signals are too strong
D.their SES may recive the signals from unwanted satellite

单项选择题The coordinated broadcast and automated reception of MSI via the INMARSAT EGC system using English to meet the requirements of the SOLAS Convention:（）.

A.international NAVTEX Service
B.FleetNET Service
C.SafetyNet Service
D.WWNWS

单项选择题All NAVTEX messages（）owing to their nature of importance.

A.can suppress
B.can be suppressed
C.can not be suppressed
D.are to be suppressed

单项选择题The difference between international and national Navtex Service is limited to（）.

A.frequency allocated
B.both language and frequency
C.language used
D.transmission power and time

单项选择题A Navtex station in each NAVAREA is usually allowed to have（）for transmission.

A.10 minutes every 4 hours
B.half an hour every other hour
C.irregular period of time
D.5 minutes every two hours