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單項(xiàng)選擇題

The NCS of INMARSAT-A system in the IOR is in（）.

A.Goonhilly, UK
B.Yamaguchi, Japan
C.Perth, Australia
D.Southbury, USA

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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

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