單項選擇題

why should the SES operators be very careful when the ship enters the area where three ocean regions overlap? Because（）.

A.the weather over there 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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單項選擇題

The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.

A.sometimes
B.all times
C.never
D.partly

單項選擇題

The identification character of each Navtex station is regarded as（）to the messages.

A.the only preamble
B.a part of the preamble
C.the closing
D.the suspension