单项选择题

The shortest distance between any two points on earth defines a（）.

A.small circle
B.great circle
C.rhumb line
D.hyperbola

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单项选择题

The positions and characteristics of lights and buoys shown within the port area are（）.

A.untrue
B.impossible
C.suspectful
D.unimportant

单项选择题

The period of a lighted aid to navigation refers to the（）.

A.date of construction or establishment
B.length of time between flashes of the light
C.time required for the longest flash of each cycle
D.time required for the light to complete each cycle