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單項選擇題

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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單項選擇題

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

單項選擇題

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