单项选择题
A.SES/DSC/EPIRB B.SART/radiotelephone C.COSPAS-SARSAT D.both B and C
Mariners can use DSC for（）.A.general communicationB.dis...
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
Equipment requirement vary according to（）.A.Ship owners...
单项选择题Equipment requirement vary according to（）.
A.Ship owner‟s will B.economic condition C.the area in which the ship operates D.different orders of all countries
The WWNWS establishes three types of navigational warni...
单项选择题The WWNWS establishes three types of navigational warning:（）.
A.Distress, Urgency and Safety B.Vital, Important and Routine C.NAVAREA, Coastal and local D.gale, Tsunami and Ice
