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單項(xiàng)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

單項(xiàng)選擇題

The complying vessels can transmit ship-to-shore distress alerts by at least（）.

A.one means, whether satellite or terrestrial techniques
B.two means, whether satellite or terrestrial techniques
C.two separate and independent means, each using different radio communication services
D.two means, such as MF DSC and HF DSC