问题
单项选择题
Mariners can use DSC for（）.
A.general communication
B.distress alerting and safety calling
C.receive MSI
D.both B and C
答案
参考答案：B
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Mariners can use DSC for（）.
A.general communication
B.distress alerting and safety calling
C.receive MSI
D.both B and C
参考答案：B