单项选择题
The INMARSAT system is open for use by（）countries on a non-discriminatory basis.
A.some B.lots of C.many D.all
单项选择题 Within the polar areas it is（）to see a satellite in geostationary orbit.
单项选择题 The position of INMARSAT AOR-W satellite is（）above the equator.
单项选择题 The complying vessels can transmit ship-to-shore distress alerts by at least（）.
