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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相关考题
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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
