單項(xiàng)選擇題

What information will a distress alert contain?（）

A.nature of distress
B.type of assistance required
C.course and speed and time at which the information was recorded
D.A, B, C are all right

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單項(xiàng)選擇題

The ARQ mode should be applied（）.

A.when two stations communicate with each other
B.in any radio system and at any time
C.when one ship sends a message to another station
D.for communication among some stations

單項(xiàng)選擇題

It is required that ships proceeding at sea should keep continuous watch on（）.

A.VHF channels 16 and 13
B.Appropriate DSC distress and safety frequencies
C.INMARSAT TDM message channel
D.VHF channel 70 and channel 8