问题
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
答案
参考答案：C