单项选择题
A.no matter where they are and what time it is B.at scheduled time and in major ocean regions C.at fixed time and position D.when they get permission
General radio communications in the global system may（）...
单项选择题General radio communications in the global system may（）ship’s safety.
A.be responsible for B.have an impact on C.command D.give a guidance to
The distress alert should（）the ship in distress.A.ident...
单项选择题The distress alert should（）the ship in distress.
A.identity B.identical C.identify D.identification
Vessel in distress（）indicate their position by any meth...
单项选择题Vessel in distress（）indicate their position by any method.
A.cannot B.are no allowed C.have the right D.should get permission to
