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
单项选择题 When a pushing vessel and a vessel being pushed are rigidly connected in a composite unit，they shall be regarded as（）.
单项选择题 What determines if a vessel is restricted in her ability to maneuver?（）.
单项选择题 Vessels shall be deemed to be in sight of one another only when one（）from the other.
