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.
单项选择题 The INMARSAT system has five major components, they are:（）
单项选择题 The INMARSAT consists of（）major components.
