单项选择题
The NCS of INMARSAT-A system in the IOR is in（）.
A.Goonhilly, UK B.Yamaguchi, Japan C.Perth, Australia D.Southbury, USA
单项选择题 The position of the INMARSAT satellite over the Atlantic Ocean Region-W is（）.
单项选择题 Mariners should pay much attention in the overlapped area owing to（）.
单项选择题 The satellites over the major ocean regions cover the globe（）.
