單項(xiàng)選擇題

What would NOT be a distress signal?（）

A.MAYDAY sent by radiotelephone
B.Continuous sounding of fog horn
C.Green star shells fired from a launcher
D.Square flag and ball in a vertical line

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單項(xiàng)選擇題

What would most likely prevent a SART’s signal from being detected?（）

A.Signal absorption by the ionosphere
B.Heavy sea swells
C.The rescue personnel were monitoring the 10-cm radar
D.The rescue personnel were monitoring the 3-cm radar

單項(xiàng)選擇題

What is the primary purpose for Digital Selective Calling (DSC)?（）

A.DSC provides reception of weather and navigational warnings plus search and rescue information
B.DSC provides low-cost，routine communications for the vessel operator
C.DSC is to be used for transmitting and receiving distress alerts to and from other ships or coast radio stations via radio
D.This aids SAR authorities in tracking a vessel's position by satellite