你可能感興趣的試題

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

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