单项选择题
The COSPAS-SARSAT 406MHZ system was adopted as an element of the GMDSS by IMO in（）.
A.1992 B.1980 C.1984 D.1988
单项选择题 COSPAS-SARSAT has the function of（）.
单项选择题 SafetyNet is a maritime safety information broadcast service offering（）on suitably equipped ships.
单项选择题 （）can receive MSI sent by coast station.
