单项选择题

On entering from seaward，a starboard side daymark will（）.

A.show a fixed red light if lighted
B.show a Morse (A) white light
C.be square in shape
D.have an even number if numbered

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单项选择题

Navigation lights must be displayed in all weathers from sunset to sunrise. They also（）.

A.must be displayed when day signals are being used
B.must be displayed when moored to a pier
C.may be extinguished at night on open waters when no other vessels are in the area
D.may be displayed during daylight

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Lighted information markers show（）.

A.green lights
B.red lights
C.yellow lights
D.white lights

单项选择题

If your vessel were proceeding down river (descending)，a green square marker with a green reflector border on the right bank would be a（）.

A.mile board
B.dredging mark
C.passing daymark
D.crossing daymark