问题
单项选择题
which function is the most important one of the GMDSS.（）
A.alerting
B.on-scene communication
C.safety information
D.general communication
答案
参考答案：A
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which function is the most important one of the GMDSS.（）
A.alerting
B.on-scene communication
C.safety information
D.general communication
参考答案：A