單項(xiàng)選擇題

A line on the Earth parallel to the equator is a（）.

A.gnomonic curve
B.small circle
C.meridian
D.great circle

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單項(xiàng)選擇題

A line of position formed by sighting two charted objects in line is called a(n)（）.

A.relative bearing
B.range line
C.track line
D.estimated position

單項(xiàng)選擇題

A lighthouse can be identified by its（）.

A.painted color
B.light color and phase characteristic
C.type of structure
D.All of the above

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