单项选择题
A.a fixed area or Navarea in any ocean region B.a Navarea or weather forecast area C.the designated area or given geographic position D.anywhere of the world
As each MSI message will have a unique identity, the pr...
单项选择题As each MSI message will have a unique identity, the printing of messages already received correctly is（）.
A.automatically suppressed B.finished by the operator C.manually suppressed D.done again
DSC distress acknowledgements are normally transmitted ...
单项选择题DSC distress acknowledgements are normally transmitted by（）in respond to a receiver DSC distress call.
A.Ship stations B.Coast stations C.NCSs D.NCC
Distress and safety communications following DSC callin...
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
