单项选择题
A.distress and safety radio communication purposes B.life-saving purpose C.GMDSS requirements D.emergency position
All ships which, in accordance with the present Convent...
单项选择题All ships which, in accordance with the present Convention, are required to carry radio installations shall carry（）.
A.Q-code B.Telephone numbers and addresses C.the international Codes of Signals D.radio instructions
Digital Selective Calling means a technique using（）whic...
单项选择题Digital Selective Calling means a technique using（）which which enables a radio station to establish contact with, and transfer information to another station or group of stations and complying with the relevant recommendations of the CCIR.
A.digital codes B.code messages C.norse codes D.distress messages
（）means a technique using digital codes which enables a...
单项选择题（）means a technique using digital codes which enables a radio station to establish contact with, and transfer information to another station or group of stations and complying with the relevant recommendations of the CCIR.
A.DSC B.MSI C.EGC D.NBDP
