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
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相关考题
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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
