单项选择题
A vessel is approaching from dead ahead.Both of her sidelights are visible and her range lights are in line.Which of the following could you do first（）.
A.Sound one blast of the whistle
B.Alter course to starboard
C.Construct a radar plot
D.Sound the danger signal
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When a pushing vessel and a vessel being pushed are rigidly connected in a composite unit，they shall be regarded as（）.
A.a tugboat
B.a sailing vessel
C.a power-driven vessel
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What determines if a vessel is restricted in her ability to maneuver?（）.
A.Whether or not all of the vessel's control equipment is in working order
B.The vessel's draft in relation to the available depth of water
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Vessels shall be deemed to be in sight of one another only when one（）from the other.
A.can be observed visually
B.can be observed by radar
C.can be located on the radar
D.can be heard
