單項(xiàng)選擇題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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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題The receiving stations can use the B2 character to()different, classes of messages.

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

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題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