单项选择题

A nun buoy will（）.

A.be green in color
B.have an even number
C.be left to port when entering from seaward
D.be cylindrical in shape

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单项选择题
A mid-channel buoy，if lighted，will show a（）.

A.fixed red light
B.Morse (A) white light
C.green light
D.flashing red light
单项选择题
A line on the Earth parallel to the equator is a（）.

A.gnomonic curve
B.small circle
C.meridian
D.great circle
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