单项选择题
A.the main source of energy B.emergency source of electrical power C.the reserve source of energy D.all of above
The NCS of INMARSAT-A system in the IOR is in（）.A.Goonh...
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
The position of the INMARSAT satellite over the Atlanti...
单项选择题The position of the INMARSAT satellite over the Atlantic Ocean Region-W is（）.
A.180E above the equator B.64.5 E over the IOR C.15.5W along the straight line D.55.5W above the equator
Mariners should pay much attention in the overlapped ar...
单项选择题Mariners should pay much attention in the overlapped area owing to（）.
A.complicated circumstances B.changeable atmospheric pressure C.large density of traffic D.some strong signals from unwanted satellites
