单项选择题
A preferred-channel buoy may be（）.
A.lettered
B.spherical
C.showing a white light
D.All of the above
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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
A plane perpendicular to the polar axis will never form what line on the Earth’s surface? （）
A.Great circle
B.Equator
C.Small circle
D.Meridian
