问题
单项选择题
Distress and safety communications following DSC calling will be performed by radiotelephony or（）.
A.NBDP
B.EGC receiver
C.NBDP or both
D.EGC receiver or both
答案
参考答案：C
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Distress and safety communications following DSC calling will be performed by radiotelephony or（）.
A.NBDP
B.EGC receiver
C.NBDP or both
D.EGC receiver or both
参考答案：C