單項選擇題

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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單項選擇題

Lighted information markers show（）.

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

單項選擇題

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

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

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Lighted information markers show（）.

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

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