单项选择题

A preferred-channel buoy will show a（）.

A.white light whose characteristic is Morse (A)
B.group-occulting white light
C.composite group-flashing (2 + 1) white light
D.composite group-flashing (2 + 1) red or green light

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A preferred-channel buoy may be（）.

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

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

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