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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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