单项选择题
An ECDIS is required to display which information?（）
A.Soundings
B.Waypoints
C.Meteorological data
D.Radar targets
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单项选择题
An ECDIS is required to display which information?（）
A.Radar targets
B.ARPA vectors
C.Hydrographic data
D.All of the above -
单项选择题
A tall object with a light on or near the shore，to act as a guide or warning to mariners is called（）.
A.beam
B.radar
C.light beacon
D.reflector -
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A radar range to a small，charted object such as a light will provide a line of position in which form?（）.
A.Straight line
B.Arc
C.Parabola
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