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单选题
A preferred-channel buoy may be（）.
A
lettered
B
spherical
C
showing a white light
D
All of the above
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white light whose characteristic is Morse (A)B
group-occulting white lightC
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单选题A preferred-channel buoy may be（）.A
letteredB
sphericalC
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单选题A buoy，being a shape of cylinder and with red group flashing，shows that it is（）.A
left-side buoyB
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