However, reception of certain types of MSI messages, such as shore to ship distress alerts and navigational and meteorological warning are（）.<br>A:selective and can be suppressed by ships<br>B:mandatory and can not be suppressed by ships in the affected area<br>C:not very important so that ships don‟t require them<br>D:received by all ships wherever they are

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

出自：海船船员证

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