单项选择题
A.they all have different limitations with respect to coverage B.they all have different limitations in the technology they use C.different systems apply to different ships D.all of above
（）communication are intership VHF radio telephone commu...
单项选择题（）communication are intership VHF radio telephone communication.
A.ship-to-shore B.shore-to-ship C.bridge-to-bridge
The INMARSAT system is open for use by（）countries on a ...
单项选择题The INMARSAT system is open for use by（）countries on a non-discriminatory basis.
A.some B.lots of C.many D.all
Within the polar areas it is（）to see a satellite in geo...
单项选择题Within the polar areas it is（）to see a satellite in geostationary orbit.
A.impossible B.possible C.easy D.difficult
