單項選擇題

However, reception of certain types of MSI messages, such as shore to ship distress alerts and navigational and meteorological warning are（）.

A.selective and can be suppressed by ships
B.mandatory and can not be suppressed by ships in the affected area
C.not very important so that ships don‟t require them
D.received by all ships wherever they are

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單項選擇題

The International SafetyNet Service is able to address the call to（）.

A.all vessels
B.selected groups of ships
C.a particular ship
D.A, B, C are all right

單項選擇題

DSC distress relays can be transmitted by either（）or（）.

A.a coast station/a ship station
B.an EPIRB/a SART
C.ARQ/FEC
D.a back-up satellite/a land SAR unit

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However, reception of certain types of MSI messages, such as shore to ship distress alerts and navigational and meteorological warning are（）.

你可能感興趣的試題

The International SafetyNet Service is able to address the call to（）.

DSC distress relays can be transmitted by either（）or（）.