Which message categories cannot be disabled by the GMDSS radio operator（）.<br>A:Navigational Warnings<br>B:Meteorological Warnings<br>C:Search and Rescue Information<br>D:All of the above

Which message categories cannot be disabled by the GMDSS radio operator（）.
A:Navigational Warnings
B:Meteorological Warnings
C:Search and Rescue Information
D:All of the above

出自：海船船员证

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