单项选择题
The GMDSS defines four sea area based on the（）.
A.location and capacity of the facilities located on board ships
B.Position and type of a sincre sintion
C.Capacity and location of shore based communication facilities
D.Position and capacity of mobile communication stations
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单项选择题
The position of the POR satellite in the Inmarsat system is（）above the equator.
A.55.5W
B.64.5E
C.15.5W
D.178E -
单项选择题
There is actually an overlapped area of（）ocean regions somewhere in Western European waters.
A.two
B.three
C.more than two
D.more than three -
单项选择题
The INMARSAT system has five major components, they are:（）
A.Space Segment, NCC, RCC, SES, and CES
B.Space Segment, a satellite system, C system, NCC and NCS
C.Space Segment, NCC, NCS, CES and SES
D.A system, C system, satellite system, earth stations and NCS
