单项选择题

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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单项选择题

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

单项选择题

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

单项选择题

A.fixed red light
B.Morse (A) white light
C.composite group-flashing light
D.yellow light