单项选择题
A.1982 B.1980 C.1984 D.1988
which function is the most important one of the GMDSS.（...
单项选择题which function is the most important one of the GMDSS.（）
A.alerting B.on-scene communication C.safety information D.general communication
The quality of EGC message is（）affected by the position...
单项选择题The quality of EGC message is（）affected by the position of the ship, the time of reception and climatic condition.
A.sometimes B.all times C.never D.partly
The information flow of the MSI broadcast must be contr...
单项选择题The information flow of the MSI broadcast must be controlled（）.
A.to avoid mutual interference B.to keep silence C.owing to the time-share nature D.to regulate transmitter power
