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

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單項(xiàng)選擇題

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

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