An ECDIS is required to display which information?（）

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

单项选择题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
D.Hyperbola

单项选择题A radar display which is oriented，so that north is always at the top of the screen，is called a(n)（）.

A.relative display
B.composite display
C.stabilized display
D.unstabilized display

单项选择题A radar display in which North is always at the top of the screen is a(n)（）.

A.unstabilized display
B.stabilized display
C.composition display
D.relative display