單項選擇題

A preferred-channel buoy may be（）.

A.lettered
B.spherical
C.showing a white light
D.All of the above

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單項選擇題

A plane that cuts the Earth’s surface at any angle and passes through the center will always form（）.

A.the equator
B.a great circle
C.a small circle
D.a meridian

單項選擇題

A plane that cuts the Earth’s surface and passes through the poles will always form（）.

A.the equator
B.a loxodromic curve
C.a small circle
D.a meridian

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