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單項選擇題

The INMARSAT system is open for use by（）countries on a non-discriminatory basis.

A.some
B.lots of
C.many
D.all

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單項選擇題

Within the polar areas it is（）to see a satellite in geostationary orbit.

A.impossible
B.possible
C.easy
D.difficult

單項選擇題

The position of INMARSAT AOR-W satellite is（）above the equator.

A.55.5 W
B.180E
C.15.5W
D.64.5E

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