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 receive the signals from unwanted satellite

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热门试题

单项选择题If EGC receiver shares a same antenna with Inmarsat SES, it means that it can receive MSI（）.

A.from any Inmarsat satellite
B.from any appropriate Navtex and EGC station
C.via the satellite the SES is tracking
D.from any RCC and coast station

单项选择题The receiving stations can use the B2 character to（）different, classes of messages.

A.identify
B.Correct
C.Reject
D.Print out

单项选择题Navtex transmitter identification character（）is used to identify the broadcasts which are to be accepted by the receiver and those are to be rejected.

A.B2
B.B1
C.MAR
D.NNN

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