单项选择题

The establishment of INMARSAT as an independent organization marked a great step forward for maritime radio communications. What does “marked a great step” mean in the sentence?（）

A.To run faster than ever
B.To go forward
C.To march without stopping
D.A significant symbol of a great improvement in maritime communication

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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

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